male-female pairs, same as same-sex pairs, may get along wonderfully or they may hurt and even kill each other. the only difference between same-sex pairs and male-female pairs is the babies.
To give a very general answer to your question, as stated, you cannot say how any two chinchillas will get along with each other. Males and females get along no better or worse than two males or two females. Also, one female may get along with one male just fine and may try (and/or succeed) at killing a different male.