Syncing collections

I have one main lab collection. I don't give write access to others because I want to ensure refs are upload correctly and also not duplicated. So, the result is others create their own sub collections, then share with me.

I'm looking for the best way to sync the two collections, so I only move refs that are not in the main collection. This I think would be easy if I could have two instances of Zotero running, but it doesn't seem to do that. In 6 you can PDF tabs now, bit I cant figure out how to view tow collections. Combing and searching for duplicates does not work because I don't want to combine them, just want to delete the duplicate.

Since EndNote allows multiple instances I could export both collections and analyze but seems very round about.

thanks
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