The link in the question is actually the index from 2013. The numbers for 2014 are respectively 174 and 172, which is confirmed by the wikipedia pages linked by Mark Mayo: Swedish passport, Dutch passport.

However, the answer to my question seems to be: it's not true that a Dutch passport gives less access to countries than a Swedish passport. Inspecting the tables in the same wikipedia pages learns that:

The Netherlands has free travel rights to Mozambique and Kazakhstan over Sweden, whereas Sweden has free travel right to Vietnam and Rwanda over the Netherlands.

So they actually tie in number of countries. The index however, is about "countries and territories". So the difference must lie in different access to certain territories.

The link in the question is actually the index from 2013. The numbers for 2014 are respectively 174 and 172, which is confirmed by the wikipedia pages linked by Mark Mayo: Swedish passport, Dutch passport.

However, the answer to my question seems to be: it's not true that a Dutch passport gives less access to countries than a Swedish passport. Inspecting the tables in the same wikipedia pages learns that:

The Netherlands have free travel rights to Mozambique and Kazakhstan over Sweden, and Sweden has free travel right to Vietnam and Rwanda over the Netherlands.

So they actually tie in number of countries. The index however, is about "countries and territories". So the difference must lie in different access to certain territories.