Personally I think they are Favia speciosa (a very nice and probably rare version) and Favites spinosa (yet another very nice morph). I think that Montastreas are pretty uncommon in the hobby and most are pretty bland as well.
I think we had a situation like this just recently. I definitely believe that Donavons is a pentagona because the septa are all uniform. If you look at the first one you can see that the septa alternate between short and tall. I'm obviously no taxonomist so I could be totally off but that is just what I think. Either way they are both really cool and I wouldn't mind getting my hands on frags of both.
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