Repaint

From Transformers Wiki

The term repaint is often used as a synonym for a redeco by fans, but that usage is technically incorrect. A repaint is a toy where only the paint applications have been changed, using the same base plastic colors as a previous incarnation of the molding.

Repaints are in fact a rarity among Transformers toys (since almost all instances of extensive color changes involve a change in the base plastic colors), but they do exist. Interestingly enough, the most noteworthy examples of repaints in the Transformers toy line are all exclusives...