Bonkey my 18 month old brothers are seperated at night in their indoor winter cage.
I got them last October as 1 year olds and they came in at night for Guy Fawkes.
They had a violent 'interaction' after too much coriander (but they will trough as much parsley as possible. Go easy on parsley though, just a couple of sprigs. We give some most nights as a cuddle treat, but not too much).
My boars are out in their Pighouse all day and night now since Easter. In the winter they went out every day with hot water bottles.
I'm assuming your boys are indoor guineas.
I reckon they just need the space,bear in mind they've only been together a few days and have probably been in each others faces since they met.
Our indoor cage for 2 adult boars is 4'x2' and my DH put a thick metal grill in the middle. I put Catsan, newspaper and a load of hay then give each a dish of veg.
They were fine all winter like this (but it's only at night).
In the pighouse haybox they don't sit side-by-side. In the run they have a hedgehog house and sit in there together.
Yours boars are just asserting themselves. They are noisy,terratorial animals. They need space and more important their own private space. Ours like to know the other one is there.we cuddle them in seperate rooms, DD takes her GP next door, GP2 is fine. But if I catch GP2 and leave GP1 in the run (I can only catch them one at a time) GP2 gets very fretfull.
Play it by ear.Make sure they've got lots of food and hidey spaces, boxes to chew.
And it goes without saying we gave no more coriander.
. It was quite nasty actually. Little GP2 got his teeth right onto GP1 back, but no skin broken.
Now it's a case of pushing each other out of the way and a bit of grumbling but nothing more serious.