I don't see anything wrong with y'all carrying 2 rifles. As long as you have a muzzy elk tag too they can't say anything, unless it's a handy cap hunting season.
There are two scenarios' that come to mind if that's the case.
1. If you have a companion permit, that allows you to shoot.
2. If you have a multi-season permit.
Outside of that, if you both are hunting with a muzzle loader go for it.
Now another thing, If you are on the boundary of a weapons restriction area, and your hunting both units, I would have in the rig, both a muzzle loader, and a rifle.
Hunterman(Tony)