Before I answer that question...I'll ask you to hold off on making so many different post within the same Forums and bunch your questions into 1 post at a time instead.
The DigiQR is the SAME thing as a DigiQ, but with 1 extra 'gimmick' to them. They either have Head/Tail lights or the pseudo-front steering system (the front wheels are a little loose, instead of stationery on the regular DigiQ and when turning, Centrifigul (I believe that's the term) pushes the front wheels in the same direction the car is turning and therefore helps with steering.