E-Revo/SUMMIT Foam Pad Chassis - difference?

Found this 5622X http://www.wheelspinmodels.co.uk/products/5622X.jpg
and the stock grey 5622 http://www.traxxas.dk/images/TRX5622.jpg

But what is the diffrence between these two?
Only diffrence i can find is that the X is almost black, but the X is cheaper?!

IMO the "X" is the coolest foam pad, so if the only diffence is the color and price i go for the X

X should be the same color as the standard one, difference being the holes for the shift servos and diff lock out servos, etc. that are on the Summit. The color difference is likely a photo issue, as the Summit chassis is their standard gray.