Quote:
Originally Posted by theducks
I believe it is Title - Author (and that is not 100% guaranteed to catch spelling diffs)
Consider setting the auto merge Preferences: Adding Books: Adding actions to what you would like.
Find Duplicates Plugin has way more compare options 
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If Add Books is set to get metadata from file name it only compares Title, viz:
Not sure what it does if Add Books is set to get metadata from the format file, I don't use that option.
BR