As far as the actual shafts themselves, you said there dosnt seem to be any unusual wear on them. so swapping side to side will slide right in no problem. But only talking the shafts, were you may have a difference is the backing plate / brake assembly. Pretty sure the parking brake lever sits on the back side of the axel on either side. meaning if you flipped the whole set up that wouldn't work. you could press the backing plates off and switch to the opposite shaft. Good luck
