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Try diff in the following combination of zsh/bash process substitution and colordiff in CLI:

diff -y <(xxd foo1.bar) <(xxd foo2.bar) | colordiff

Where:

• -y shows you differences side-by-side (optional)
• xxd is CLI tool to create a hexdump output of the binary file
• colordiff will colorize diff output (install via: sudo apt-get install colordiff)
• add -W200 to diff for wider output

Hints:

• if files are to big, add limit (e.g. -l1000) for each xxd

Sample output: