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Just to add a little more information, maybe not new:
I downloaded the same book via K4PC and from Big A's website to sideload - I wanted to see if there were any differences. After DRM removal, the .awz3 files still had different hashes.
I used KindleUnpack and used a tool to diff the folders, all that was different were 2 lines in the content.opf in the OEBPS folder.
I see <meta property="dcterms:modified">2016-03-24T00:39:51Z</meta>
and then a 422 hex character long watermark.
<meta name="Watermark (hex)" content="XYZ" />
For me, the books share the same first 20 characters of the watermark.
Also, further in the watermark, there is a shared 169 characters.
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