How old are the two roos now? Cockerels usually appear to get along until around six months, then the hormones kick in and all hell can break loose.
I have two roos that I raised together in the same brood, a Brahma and a Cochin. They were best buddies until one day they just started beating each other up. And it got worse. And still worse.
By that time, I loved them both, and decided to just keep them separated. They have their own bachelor coop but with poultry screening down the middle.
One is usually in a separate pen while the other gets to free range, and they swap every other day. A week ago, the wind blew open the pen gate, and before I knew what was happening, those two had found each other and were going at it claw and beak. I got to them pretty fast, but not before one was bloodied and torn up pretty good.
You'll be very, very fortunate if your two roos end up getting along. It's entirely possible they will. But keep a very close watch on them. One day they can be best friends, and the next day the hormones can change everything.