The setup should be the same (independent multi-link up front, with semi-independent multi-link beam at the back) but the spring rates and damper settings will almost certainly be different - probably softer.
Why would you go for the US spec anyway?
I was thinking about buying some second hand H&R Springs and kyb shox from a bloke in america
Thing is, all I want is some cheap suspension and shocks!!
Maybe you can answer this too mate, Koni make shocks for a P11 GT but the standard model isnt listed. surely they arent different between the models tho? Is it just that they mean the shocks are meant for the GT springs, so if I buy new springs (H&R) it will all fit....... help!!!