
As the others said it is worth a try.
Really though your problem is the fact that you ahve two males of the same age and similar status, one of the reasons why having smae age or littermates is a bad idea. Many people say Oh mien are great together and when you query further you find that both are still immature.
The fighting starts when they are fully mature and most likely when there is something worth fighting for, in this case a maturing bitch.
I wouldn't have expected any different as your bitch is approaching puberty and they want to sort6 out which is going to be her mate.
Many people have no trouble with males living together, as long as there are no Entire bitches to upset the staus quo.