Just as a little supplement to the Greatshot review to show all the mold differences between him and Sixshot.
You can see the remolded shoulders very easily here, note that the Greatshot is unused, so we can't do an accurate differences between the stickers comparison, but they are different all around as well. The teal and purple colourscheme is still my favorite, so that scores one for Sixshot.
In car mode, there's not real difference other than the colours. The remolded shoulders make exhaust pipes, sort of.
In the tank mode, Sixshot has the little cockpit that comes out of the beast head, Greatshot does not.
In gun mode, you can clearly see the remolded chest, wings, and torso. More detail added to them all around.
Beast mode gains a brand new rhino head. With a folding horn so it can stash in the same area that Sixshot's does.
Lastly, the robot mode, where most of the new molded parts are shown off very clearly. The head also is remolded with all new flip out chrome horns rotate into the sides of his head. Sixshot also sports a rubsign, where they left it off for Greatshot.