No it is different.
Winter Blast: Freeze enemies (Durr).
Winter Blast +: Freeze enemies in a solid block of ice that can be thrown with telekinesis.
Winter Blast ++: Charge to create a constant stream of ice to freeze foes and enemies killed when frozen drop a lockbox of loot.
I think that "Lockbox" thing applies to Winter Blast + as well, but I'm not sure.
Winter Blast: Freeze enemies (Durr).
Winter Blast +: Freeze enemies in a solid block of ice that can be thrown with telekinesis.
Winter Blast ++: Charge to create a constant stream of ice to freeze foes and enemies killed when frozen drop a lockbox of loot.
I think that "Lockbox" thing applies to Winter Blast + as well, but I'm not sure.