Cute little guys I love your buns helicopter ears.
Just fyi in case you aren't aware, males will start to become hormonal and start humping, usually around 10-12 weeks old. That is usually when they will need to be separated as this hormonal behavior can agitate the other bun and could lead to fights and serious injury. So for another week or two they may be fine together, but at the first sign of humping, chasing, or pulled fur, or 12 weeks old, whichever comes first, you will want to separate. If you plan on neutering and trying to rebond afterwards, it would be good to keep them in cages/enclosures next to each other, so that they can maintain their baby bond, which may help with future bonding attempts(at least 4-6 weeks post neuter).