Hi, they can be sisters as well just if they are mixed breed there can be differently looking babies in the same litter. From your avatar pic one looks like a lionhead to me and couldn't see the other one as photo is too small.
It is possible that they will start humping each other and there can be some fur flying around sometime between 3-7 months, depending on how fast they become sexually active, if there's no major fights or hate, aggression they might be able to sort out their dominance and will stay bonded together for life. In my experience lionheads are exceptionally friendly and laid back, bt there's no guarantee as all rabbits have their own personalities.
It is also possible that they will get very territorial and aggressive towards each other, if that happens it would be best to separate them and fix them both, then wait about 2 months after surgery and try introducing them again, there's a chance that they will bond.
So for now if they are still 10 weeks just watch for signs in my experience girls would start at 5-7 months later than most boys so if you see extensive humping/chasing/fights you better take action but maybe you are lucky and they will sort it out in an amicable manner.
10 weeks is too early for girls so you have at least one or two months of peace