Yep, they'll change. And along with that will come a lot of rumbling, chattering, humping, chasing, and stanking. You may even have to separate them for a while if one of them is just determined to be a real tyrant.
How big is your cage? Adolescent males need a LOT of space, and a wider cage seems to work better. If it's only two grids wide, or the equivalent distance in whatever you've got your cage built of, some pigs won't be able to go past one another in a narrow corridor without starting a squabble. If it's three or larger, they're able to get away from one another with fewer problems.