They are living animals so no one can give you guarantees one way or the other, but that’s not a lot of room. Age makes a difference too, there is a difference in cockerels and roosters and how well they control their hormones.
I’ve also had a cockerel kill another cockerel. I was raising 18 cockerels in my flock with an adult rooster and 7 hens. I bought the cockerels so there were no pullets in the mix. Around 16 weeks of age one took an intense dislike to another and consistently chased and attacked him. I was waiting for them to grow a bit more before I ate them but one day the weaker cockerel was killed. After that the 17 cockerels got along OK. I put them in the freezer in three batches, 18, 21 and 25 weeks. Just something in their personality caused one to really dislike another. I thought I had enough room for them to work it out. It had always worked in the past but not in this case.
They can fight to the death but what normally happens when chickens fight (hens, pullets, and cockerels as well as roosters) is that at some point one decides they are better off running away than continuing the fight. There is often some chasing involved and possibly a rematch or two, but eventually they reach an accommodation. They recognize which one outranks the other and get along peacefully, maybe the weaker avoiding the stronger, sometimes not. Usually once they work out the pecking order/dominance issues they get along OK. A very important aspect of this is that they have to have enough room to run away, get away, and avoid. You don’t have a lot of room.
When two mature roosters reach an accommodation they normally divide the flock, each getting his own harem. They may sleep in the same coop at night but set up different territories during the day. It’s best not to leave them locked in the coop too long after they wake up either. They are avoiding each other during the day. If the dominant rooster sees the subordinate mounting a hen he just might knock him off, thus causing conflict. If they don’t have enough room to avoid each other you set the stage for a lot of potential conflict. You are taking a chance.
But there is another argument where it might work. Seems like there always is another argument with chickens and their behavior. Hatcheries want all their eggs fertile but they don’t want to pay to feed any more roosters than they have to. They generally use the pen breeding system. This is where all the roosters and hens are put in the same pen and allowed to mate at random. In a different thread CT said that in Kenya they use a 7 to 1 ratio, while here in the states a 10 to 1 ratio is normal for full sized breeds and maybe 12 or even 15 to 1 for bantams. The monitor fertility and add more roosters if they need to so the ratios are a bit fluid. These ratios are about fertility only. You’ll often see these ratios quoted on this forum as if they are magic numbers where they resolve all problems, but they have nothing to do with roosters fighting, hens being over-mated, anything like that. It’s just about fertility in the pen breeding method.
They may have 20 roosters and 200 hens in the same pen and all the roosters don’t kill each other. But if you have 20 chickens at 4 square feet per chicken, you have 80 square feet total. If you had 200 chickens at 3 square feet per chicken they still have 600 square feet work with. Quite a difference. That’s a lot more room to run away.
Normally one fairly active rooster can keep 20 or more hens fertile in different housing methods. Many of us have seen that. But each flock has its own dynamics and each chicken has its own personality. You’d need to check the eggs for fertility to see how it’s working out for your flock. Personally I’d be comfortable with one rooster with 17 hens as far as fertility.
I always advise keeping as few roosters as you can and still meet your goals. That’s not because you are absolutely guaranteed problems with more roosters, just that it is more likely. I don’t know your goals or how many roosters are right for you. You can certainly try keeping both but have a plan B ready. You may or may not need it, but if you do, you’ll need it quickly.