Winter White brothers?

Ok. I just got two winter white male hamsters from petsmart, and they are the cutest little things!!! Their names are Rubix and Lotto. They are both brothers. When I got them, they were in the gl cage in the igloo together cuddling at the store. I got them home, they have been doing fine, and they were being really affectionate towards eachother. They were grooming eachother and cuddling and a couple minutes ago they were wrestling a bit and making this squeaking sound. Then they would go and cuddle and groom eachother and they even shared the water bottle at the same time... hahah. Do you think they were just playing? None of them look hurt. They are still very active.