If they are not fighting, then there isn’t an immediate problem. Guinea pigs aren’t always cuddly and want to sit with each other but it doesn’t mean they don’t like each other. My two boys don’t sleep in the same bed, aren’t affectionate with each other but they get on absolutely fine.
If there is bullying going on and one piggy is not letting the other eat and the bullied piggy is constantly being mounted each, losing weight and is unhappy, then that is a different matter and they will need to be separated. You would want to establish the state of their relationship first.
You are also need to bear in mind that if two boys are kept in too small of a cage, then that in itself can cause problems within their relationship. What size is the cage the boys are kept in? They need to have a large cage of at least 150cm x 60cm. Anything less than that can add to tensions within a pair of boys relationship.
If you do feel you want to separate and have them both in with s sow each, then a 2x5 split in half will not be big enough. You will want to give each pair at least a 2x4 cage each. I would recommend a 2x5 each.
You need any sow to accept the boar, so just going out and buying two sows, then you have absolutely no idea if that is going to work out. The best thing is to get a rescue centre to help you to find a compatible sow for each boar. Character compatibility and mutual liking is the key to any successful bond.