The cans, silencers, mufflers or what ever you want to call them are GENERALLY the same. It is indeed the mid pipe and hardware that is different. Should be able to do it! I have the M4 high mount and I love the way it looks!
I was going to get a new midpipe and make my holeshot standard mount into a high mount, but there is a difference. It WILL work, but the highmount can is 3 inches shorter than the standard. It just might stick out past the tail too much and look funny, but thats about it.