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They might eventually be aggressive towards one another, but its other fish I would worry about. As a general rule, damsels are aggressive and tend to pick on tank mates. A lot off people end up removing them as they add new fish and the damsels start to pick on them. They are tough to catch too!
I have a small scooter blenny in the tank but I definately won't add anymore fish because my tank is already pretty overstocked with the two damsels and a scooter blenny :S my live rock has HEAPS of holes and hiding spots though
What will happen, will happen. They might go after one another, they might get along...you never know. Sometimes it boils down the the fishes temperament.