I think this version is the "Power and the Glory" version as it does not have the C121-010 stamp on the underbody, and has chrome wheels instead of black.

Rather than repainting the car, to differentiate it from the other three identical ones, I decided to make up my own number roundels for the front and sides, and also swapped around drivers heads from various other cars so they were all different colours. May also eventually paint the sides of the rear wing yellow to match the helmet colour, just to further differentiate it. Might repaint one or two eventually, but that is more difficult to undo if I decide to sell them off.