see personally you get a new bun you keep them apart from other buns for around a two weeks period, you dont know exactly the history of the wee thing, and just because hes so young, doesnt mean hes not carrying anything,
As for bonding, two males that are not brothers are more difficult, at the mo because his hormones havent kicked in, he may not feel a threat, or be a threat to the other bun, once they do, ( as this can start as young as 12 weeks ) you may have a problem, if they fight, there is a high chance of ruining the bond even after neutering.
While its not impossiable, to me the risks are too high, nipping is normal and often settles along with litter training after neutering,
uneutered boys fighing is truely a horrific sight often ripping holes in ears and damaging testicals as main points,causeing lots of damage and a very expensive vet bill, and unless you can keep and eye on them 24/7, ( it can take 30 seconds to inflict that amount of damage and once locked its very hard to seperate too, for which you can cause more damage).
I'd go on the safer side of caution, and wait let your wee one settle get used to you then once both buns are neutered and hormones have settled after, takes average 6 to 8 weeks post op for this, then consider bonding
Please do not feel you are in any rush, bunnies take quite a lot of time to adjust to everything,
I dont mean to sound harsh, but its coming across very rushed, Id just enjoy the lil one they dont stay so cute and teeny for long then the mischief starts, :lol: