As one of two brothers who were as close in age as your two sons, I grew up always fighting with my brother. Don’t worry, the punching and wrestling will end shortly before the boys become grandfathers. I think that’s normal for boys.
A friend who was a child psychiatrist said that living in a household with only boys is akin to living with untrained monkeys.
If you have a girl, she will have a moderating effect on the boy.
My mother got us a dog, and we teased the dog, who loved to be teased, rather than teasing our brother.
The dog was also a pacifist, so she would start barking at us when we fought with each other. In order to have a decent fight, we would have to stop, take the dog to another room, and close the door on her. By the time we were ready to resume our fight, we had forgotten what we were fighting about, and would resume our normal activity.