The spoiler is different, but it is just a subtle difference, if you take a look at the "winglets" on both sides of the spoiler, they are different shapes. Take a look for your self.
I believe the RS 4.0 didn't say GT3RS on the back, only RS 4.0. Also the side doesn't have the same graphic as the gt3rs, it would say RS 4.0 on the side. Also the rear where it says GT3RS would be a painted line instead of body color paint.
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