Yes.
ARX has a tall ride height (140mm ground clearance v 100mm for RX/RS).
ARX has plastic wheel flares
ARX has a 10mm wider track front and rear.
ARX has HICAS (this is a device on the rear of the back diff, small electric motor)
Oh,...............and the best thing of all....
ARX get 14-15psi boost over the RX/RS that have 12psi boost........