It's the mesh resoltuion that is reduced, not the textures (the RR figure does come with a fairly low resolution texture, but since the free base doesn't have any texture that's still a gain). High and low resolution textures can be used on high or low resolution figures without problem as long as the mapping is the same, which tells the mesh which relative areas of the map to apply to each area of the figure. Morphs, on the other hand, don't swap between reduced and full resolution figures.