some of it does, if youre swapping gear piece for gear piece it does (helm for helm, gloves for gloves, etc), but if you have a piece of gear that both specs dont use, like a weapon, offhand, relic etc, it throws those pieces in the bottom of your inventory, behind whatever has been added before you swapped, and if youre not paying attention and start deconstructing or vendoring stuff that you looted, those non-compatible pieces are in the mix