IIRC, newer Kindle firmwares started adding a (random?, definitely not book's ASIN) string of characters at the end of filenames of files in ".sdr" folder?
I do remember having to manually fix the "mismatch problem" the one time I copied a book and its sdr folder from my PW1 to my PW3... once I've realised that PW3 isn't showing notes and highlights that I knew I made while I was reading that book on PW1.
I had to let it create a new file then I've copied the filename, deleted that new "for notes" file and rename the one I've copied from older Kindle. After doing that my PW3 started to show those pre-existing notes.
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