The low-polygon V4s that come with DS are LoD meshes - lightened versions of the full mesh. They are not the SubD cage from which the released figure was made. A LoD mesh must have the vertices that it shares with the full res mesh in the same place, while a SubD cage's vertices will generally lay outside the final mesh (you can see this dramatically in DS or a modelling tool by sub-dividing a six favet cube).