Elmo,
It is entirely possible. It does swap out just exactly like you said. I have the 72" version and checked into it. The rub is the cost effective. Just the rake head was $525 or so. I thought that a bit extreme when just the blade was $450 or so. I opted to pass. Been admiring the First Choice rakes though.
Added note: After admiring the FC rakes, something to consider is they might just be a 1 for 1 bolt on or limited mod required to work with a LP 3ph frame. Would be much cheaper than the LP version. If you go for it, let us know.
I even had a guy willing to go almost 1/2 way with me. But I have VERY limited needs, and what with bldg a garage, it still wasn't worth it.
Nick