So I took out my brick of V3, V4, V5 and V6, stacked them up together, and realized they're at distinct heights!
The V3 Smoke (White) is the highest, then V3 Mirror (Black), followed by V5, V4 and lastly V6.
The V6 stack is a whole deck lower than the V3 Smoke; the V5 is half a deck lower than the V3 Mirror
Does anyone know if there're extra cards in the V3 decks? Or maybe different stocks between these variations?