Hi there. A girl/girl pair would be able to live together straight away. Spaying both at the same time is best for a safe reintroduction, as if you spay one first the spayed one can become aggressive as she will feel vunerable after the op, so if they can heal together it should be easy. Even two does together should be spayed as unbred does have hgih chances of uterine cancer. You should have no problems. A boy/girl pair are easiest to bond, but will have to live seperately until a month after he is neutered. Again, the female should still be spayed.

It's really up to you, bonding either pair should be smooth sailing so just choose which ever bunnies melt your heart!