"hexdiff"The hexdiff
is a program designed to do exactly what you're looking for.
usageUsage: hexdiff file1 file2
hexdiff file1 file2
It displays the hex (and 7-bit ASCII) of the two files one above the other, with any differences highlighted. Look at man hexdiffman hexdiff
for the commands to move around in the file, and a simple qq
will quit.