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A couple of points:

• The Enterprise D first encountered the Borg in Q Who which was stardate 42761.3 (~2365 AD) when Q throws the Enterprise 7,000 light years from its current position (but I'd guess that'd still put it in the Alpha quadrant).
• The Enterprise D meets Hugh ~2368AD going by the season number (no star date given)
• Voyager - although aware of them from Starfleet history, doesn't encounter them in person until Scorpion Pt 1 which is stardate 50984.3 (~2373 AD) - 8 year later or 5 years later after Hugh. Also note that Voyager is 75,000 light years away in the Delta quadrant which is where we learn the Borg originate, seem to have vast fleets and hyperspace technology and most likely have been quite happily assimilating huge amounts of species / technology in that time - there was some quite advanced technology and species that Voyager encounters that the Borg certainly would have loved.

So a possible in-universe explanation could be:

It's likely the Borg in Voyager, 8 (or 5) years in the future, in their home quadrant and in vast quantities etc... would be somewhat different than a single Borg cube that Q introduced to Picard and the Enterprise D. Also, the Borg vessel in I, Borg had suffered significant damage and where cut off from the collective.

A couple of points:

• The Enterprise D first encountered the Borg in Q Who which was stardate 42761.3 (~2365 AD) when Q throws the Enterprise 7,000 light years from its current position (but I'd guess that'd still put it in the Alpha quadrant).
• The Enterprise D meets Hugh ~2368AD going by the season number (no star date given)
• Voyager - although aware of them from Starfleet history, doesn't encounter them in person until Scorpion Pt 1 which is stardate 50984.3 (~2373 AD) - 8 year later or 5 years later after Hugh. Also note that Voyager is 75,000 light years away in the Delta quadrant which is where we learn the Borg originate, seem to have vast fleets and hyperspace technology and most likely have been quite happily assimilating huge amounts of species / technology in that time - there was some quite advanced technology and species that Voyager encounters that the Borg certainly would have loved.

So a possible in-universe explanation could be:

It's likely the Borg in Voyager, 8 (or 5) years in the future, in their home quadrant and in vast quantities etc... would be somewhat different than a single Borg cube that Q introduced to Picard and the Enterprise D. Also, the Borg vessel in I, Borg had suffered significant damage and was cut off from the collective.

A couple of points:

• The Enterprise D first encountered the Borg in Q Who which was stardate 42761.3 (~2365 AD) where we learn it's a major threat from a far flung distant part of the galaxy -- it just so happens that Q has used his powers to transport it to the Alpha quadrant.
• The Enterprise D meets Hugh ~2368AD going by the season number (no star date given)
• Voyager - although aware of them from Starfleet history, doesn't encounter them in person until Scorpion Pt 1 which is stardate 50984.3 (~2373 AD) - 8 year later or 5 years later after Hugh. Also note that Voyager is in the Delta quadrant which is where we learn the Borg originate, seem to have vast fleets and hyperspace technology and most likely have been quite happily assimilating huge amounts of species / technology in that time - there was some quite advanced technology and species that Voyager encounters that the Borg certainly would have loved.

So a possible in-universe explanation could be:

It's likely the Borg in Voyager, 8 (or 5) years in the future, in their home quadrant and in vast quantities etc... would be somewhat different than a single Borg cube that Q popped into existence as a "present" for Picard and the Enterprise.

A couple of points:

• The Enterprise D first encountered the Borg in Q Who which was stardate 42761.3 (~2365 AD) when Q throws the Enterprise 7,000 light years from its current position (but I'd guess that'd still put it in the Alpha quadrant).
• The Enterprise D meets Hugh ~2368AD going by the season number (no star date given)
• Voyager - although aware of them from Starfleet history, doesn't encounter them in person until Scorpion Pt 1 which is stardate 50984.3 (~2373 AD) - 8 year later or 5 years later after Hugh. Also note that Voyager is 75,000 light years away in the Delta quadrant which is where we learn the Borg originate, seem to have vast fleets and hyperspace technology and most likely have been quite happily assimilating huge amounts of species / technology in that time - there was some quite advanced technology and species that Voyager encounters that the Borg certainly would have loved.

So a possible in-universe explanation could be:

It's likely the Borg in Voyager, 8 (or 5) years in the future, in their home quadrant and in vast quantities etc... would be somewhat different than a single Borg cube that Q introduced to Picard and the Enterprise D. Also, the Borg vessel in I, Borg had suffered significant damage and where cut off from the collective.

A couple of points:

• The Enterprise D first encountered the Borg in Q Who which was stardate 42761.3 (~2365 AD) where we learn it's a major threat from a far flung distant part of the galaxy -- it just so happens that Q has used his powers to transport it to the Alpha quadrant.
• The Enterprise D meets Hugh ~2368AD going by the season number (no star date given)
• Voyager - although aware of them from Starfleet history, doesn't encounter them in person until Scorpion Pt 1 which is stardate 50984.3 (~2373 AD) - 8 year later or 5 years later after Hugh. Also note that Voyager is in the Delta quadrant which is where we learn the Borg originate, seem to have vast fleets and hyperspace technology and most likely have been quite happily assimilating huge amounts of species / technology in that time - there was some quite advanced technology and species that Voyager encounters that the Borg certainly would have loved.

So a possible in-universe explanation could be:

It's likely the Borg in Voyager, 8 years in the future, in their home quadrant and in vast quantities etc... would be somewhat different than a single Borg cube that Q popped into existence as a "present" for Picard and the Enterprise.

A couple of points:

• The Enterprise D first encountered the Borg in Q Who which was stardate 42761.3 (~2365 AD) where we learn it's a major threat from a far flung distant part of the galaxy -- it just so happens that Q has used his powers to transport it to the Alpha quadrant.
• The Enterprise D meets Hugh ~2368AD going by the season number (no star date given)
• Voyager - although aware of them from Starfleet history, doesn't encounter them in person until Scorpion Pt 1 which is stardate 50984.3 (~2373 AD) - 8 year later or 5 years later after Hugh. Also note that Voyager is in the Delta quadrant which is where we learn the Borg originate, seem to have vast fleets and hyperspace technology and most likely have been quite happily assimilating huge amounts of species / technology in that time - there was some quite advanced technology and species that Voyager encounters that the Borg certainly would have loved.

So a possible in-universe explanation could be:

It's likely the Borg in Voyager, 8 (or 5) years in the future, in their home quadrant and in vast quantities etc... would be somewhat different than a single Borg cube that Q popped into existence as a "present" for Picard and the Enterprise.