No issue at all. Just move them frame by frame, and make the switch. I just did this yesterday with a super about 50% capped honey and the rest full of nectar being worked. Due to the weight of it, I had the new super next to me...moved 6 frames, removed the super being replaced, put the new super on, then added the remaining 4 frames. I don't think the bees even noticed.... Just work gently, and have your game plan set so the transition is minimal.