I also noticed that the comparison works for several books if they are in a particular collection (with CalibrePortable5.99.8\Calibre Portable\calibre-portable.exe).
In other words, if a book called "ABCDE" is in two or more than two Zotero collections, the comparison might detect the book in one collection or the other but might report "Total Collection items in Calibre: 0" in another collection for the same book.
I do not know whether I have been able to communicate that to you, but would be happy to elaborate if needed.
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