Nope not as far as I know. There the same shell, front subframe is strenghened on the RS (all of them) but body wise there identical.
The only different on the 182 shell I know of is the lack of a spare wheel well compared to the 172 and Mk2 Ph2/3/4.
The Ph1 shell does differ slightly to the Ph2-4 shell slightly though, although thats all of them not just the RS's.