You misunderstand: I did not use Winmerge directly on Calibre, but on two catalogs I created from both libraries and then transfered to textfiles that I compare using Winmerge. From there it was manual work to import books and sometimes delete books from either library.
Now that I'm almost done I want to try if I can import both into one, which I can, but obviously I will have many duplicates. That is my question: how do I remove these duplicates in an easy way?
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