Thanks, but, not necessary, this was completed a couple of weeks ago now. I know how to merge libraries, as I said, and I also know how to find and handle duplicates, fwiw, although my question got cut off.
For the benefit of anyone else interested/future searches, I was asking if it was faster to strip them out first using the Find Duplicates plugin to find library duplicates, bearing in mind that would take some time to do and need some hand management vs. to just let them merge during the copy.
Turned out when testing, it really didn't slow the copy down noticeably enough to be worth spending the time dealing with it for this many items.
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