Is it okay to close a question as an "exact duplicate" when it is not in fact an exact duplicate? I'm not suggesting that word for word identical questions should be required, of course.
My question was prompted by How do I safely accept Bitcoins without waiting for confirmations which was closed as an exact duplicate of How to accept Bitcoin payments at a real world store. Aside from the obvious issue that confirmation delay is just one issue in accepting Bitcoins at a store, the questions aren't even really overlapping. For example, the question closed has a completely different set of requirements since it isn't about face-to-face transactions while the other question definitely is.
I guess I have two sub-questions:
Was this question closed by mistake, given that the really are quite different? One is about a retail store specifically and included other issues than just confirmation delay. The other was specifically about confirmation delay only, not limited to face-to-face transaction, and focused on using third-party arbitrators to avoid it.
In general, should a question be closed as an exact duplicate if it is not an exact duplicate? If the question differ in circumstances or one only includes parts of the other, shouldn't some other closure reason be used? (Assuming it even is proper to close a question just because it overlaps a previous question significantly.)