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[–] examors 0 points 1 point (+1|-0) ago 

You're right: you can't have the same post in multiple subverses without making copies.

I think you did the right thing. If you want to make it clear that the post also exists in another subverse you can always add "(x-post /v/othersubverse)" to the submission title and even post a link to it in the comments so that other goats can find it.