I would have to say, it all depends on the size of your tank, if your talk a big tank, and i am meaning a 7/8 ft, then there is a possibility, since there will be retreats for sharks, however any smaller and you are playing with fishy death, RTB do not even like their own kind, they would treat others the same way as well, i have had RTB even chase my swordies, just because of their torpedo shape body, I aint saying its impossible, because every fish is different, but its whether you would take the risk and hope you gt well behaved fish, or strike i unlucky and end up with depressing results...
My opinion is not to risk it, keep only one type of shark in your tank, if you want a RTB, just keep the one, if you want a Bala shark, have a couple (Though i have managed to get one bala shark to survive and thrive on its own), but when it come down to it, thats how they are in nature, and so hating each other just is within them...