Threads are just comments made to a hidden post which acts as a container for threads. LeoThreads was set up this way so as to not kill people's feeds and notifications.
As for differences in curation; I have no idea what they would be.
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I think that curation in comments (threads) is the same as in posts.
There is some research to be done about it, and I will also wait for the new inleo Whitepaper coming soon