Quote:
Originally Posted by unboggling
Save to disk, opfs included. Add to different library using internal metadata not filename. If I remember correctly, it happened with exact author/title matches (I don't know why I said fuzzy before, sorry, that was a broadening assumption). But it happened often enough that it propelled me toward the precise isbn solution. That was months ago. Then a couple weeks ago it dropped an exact title/author/isbn/format match during save from libraryA then add to libraryB, automerge off, add dupes yes. I'll try to replicate it again and get back to you with exact documentation.
Edit. The 2 identicals with the isbn match were both in Library A, only one showed up in Library B.
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You
SHOULD NOT be using Save to Disk to add to ANY library
To add to a
different Library: select books: Right-click:
Copy To Library 
Save to Disk is
ONLY for someplace else (that is Not a Calibre Library).