I have three different monti caps that are touching each other right now. None of the three are showing any signs of "battle" where they are touching and in fact, I think they are all growing together. Just need a little more time to tell. I am hoping for some new coloration out of it, but I am sure one will win. If yours aren't physically touching, I would say they are more than likely to get along. But as they grow, they will eventually touch unless you keep them trimmed back. And once they do I suspect one will take over the other.