Hi,
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if there's info encoded in a photo and a direct, bit-by-bit comparison is done between two decrypted files, it must show differences. If the files are identical, any steganographic content is identical, i.e., not personal (if the original files were bought by different people).
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I agree, if you have the exact same edition of the ebook bought by different people that after DRM removal show up exactly bit for bit the same (the DRM can and will be tied to the user and so will some of the metadata so you will have to remove the DRM first), then there must be no user specific identifiable material remaining in the ebook.
That said, those are not easy conditions to actually meet. It would be interesting to test that by having two different people purposely run those tests on a variety of different ebooks and formats, bought from the major bookstores and vendors.
You would also have to rule out the DRM removal software itself which can actually add in user specific info (the original CMBDTC Topaz script does just that for example).
It is better to simply not pirate ebooks. You can still remove the DRM from your own ebooks and convert them for another reader you might own or archive them by burning the html to disk and arguably be consistent with fair-use in most countries, but posting them to the web is a very bad idea (IMO) and should be discouraged.