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With the opinion of jkdfahlkdhfjgakdhfg considering the quality being inferior simply because the md5 does not match with the original, I'll dismiss it completely. I also won't bother with duplicate detection reason.

On to other EXIF data: most of the time, the images are being cleaned and therefore, such EXIF data are also goner. Additionally, many scanner does not embed such data in the first place (unlike cameras).

The only valid argument left would be the ICC color profiling.