I’ve never done it, but they should be interchangeable. I know there’s a hooded “national match” sight for the m1a as well as a larger aperture ghost ring, but the rest of the piece should be exactly the same. That being said, the garand has, in my opinion, the best iron sights of damn near every gun ive shot, and i’ve shot easily 100 different kinds. I can’t even think of one I like better off the top of my head.