Thank you Butters & osiris4isis!
They are identical 24-bit images.
Problem is, the unedited images I extract from the 'good' firmwares are 16-bit, and GIR can not handle 16-bit images at this time....
So I can modify the 24-bit bmp image to a 16-bit bmp, but GIR refuses to use it 8^(
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