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Stevethecoffee
Parcel shelf is different, as is the firewall, both to accommodate the oil tank, but from offering one up it looks like a Mezger would fit without those needing to be modified. The rear-most panel that the engine mounts to is different between the Carrera and the GT3 though, and that likely would need to be swapped, but that looks pretty straightforward.
Other than those engine bay differences the GT3 is a Carrera 4 chassis, so everything would swap across.