I extracted from BIOSes every single module decompressed and the differences shown by WinHex are only the build number and date.
Boot block (module 08) is the same bit per bit.
Module 1B has only the usual date and build differences and some bytes at the end that I think doesn't matter.........
Extended Boot Block (module 15 with EBB), see below
This is HOLE1 compare, very similar to EBB, probably where EBB fits:
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