This isn't exactly what you asked for but:
When you paste the url into the url field, PieFed does a search for you to see if the url has been posted already. If you don't see a warning, proceed.
this post was submitted on 31 Aug 2025
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Try using your PieFed account via Voyager:
https://vger.app/search
Somehow it is able to find results I couldn't directly with PieFed.
I'd try finding a community to where I'd like to post a given article, and look for its posts in the OG instance as well as in instances I have accounts on for other engines (the 3 major thread-oriented ones I know about are Lemmy, Mbin and PieFed). Other than that, of retarded/delayed results but still something I'd recommend, is to follow people in other instances (Mbin / microblogging / Peertube thing), and interact with everything the user finds so posts can propagate across instances, so at least in future searches, others, or even yourself, may find/refind posts more easily.
Lemmy UI shows you all the other posts it's aware of once you paste the title; or apply a suggested title after pasting the link.