Spark Model Porsche 911 (991) GT3RS in Birch Green. No 789 / 911pc.

I have decided to modify a gt3, non RS version by autoart, and installing parts from my GT3RS, both 996 bodies, but i first want to know if the shell is off from the same mold ? i mean fair enough if it's slightly wider and i'm pretty sure of that, but what i'm asking is would the chassis and...