I have a similar situation going on. When I adopted my boys, I was informed that one was dom, one submissive, but that it could change as they go through adolescence. They were both in-takes from an underage seizure at a Petco, and are approx. 4 months old.
From everything I've read, yes, you just have to let them figure out their hierarchy on their own... but keep an eye on them to make sure they don't get more aggressive and actually attack each other.
About an hour after I gave my boys their evening veggies, I heard them chasing each other around (which has so far been normal for them to run their laps with each other like a race), then the heavy teeth chatter started. I got up to keep an eye on them, and as I was walking to their cage there was fur flying!
I put their litter box between them and grabbed one of them out of the cage. He was the one who had the missing tufts of hair. I held him until he went docile and then put him back into the cage, took a fresh towel and with a lot of work and help from my hubby picked up the second guy after a half-dozen nips.
He kept chattering while I held him... he noticed some hay stuck to my shirt and then was suddenly calm. He climbed up and tickled my neck like usual. I added an extra hidey box and another scrap of fleece for a corner "tent", and so far they seem to be doing okay except when they both want hay... so off I go to make a second hay rack.