That is total different ball game, try to run with those and you realize how much tougher it is to hike up or traverse.
Weight sounds like more than 50% more than Backlands.
But if you just go downwards then not big issue.
Bails, Backlands have 10mm more narrow boot heel width than regular HB's, due that bails are quite sloppy without modification.
As said, not big issue on pow, but if you plan carve hard on slope, then it might be issue.