Photos looks like my old tank- same fish, same coral, same breeder box and even same shape of rockwork..
I won't worry too much if you put them in together. One will dominate eventually and they will get paired their after. I had one with his wife jumped tank, dominated over a newer but smaller mate and became the husband, and was breeding.
Random fact when I put the new clown in (which I intentionally got a smaller one) the smaller new one was in the box for a while. There was some "aggression" but they mated quickly.
Some aggression is normal, which is how they decide their gender, interfere only when it gets really bad.