Both sets offer you a new battle axe and hammer together with a new pair of longer and more detailed legs for the inner robot (colored to match each figure). Once installed, you get a taller combined mode for your collection display. The DK-13 kit for Galaxy Optimus Prime includes an extra pair of cannon fillers. The new weapons can be stored inside the cannons.
Are these upgrade kits what you were looking for? Let us know your impressions on the 2005 Boards!