If it's stock, the Rabbit has a solid lifter cam.
No, the heads are not the same. The hydraulic one has the #4 cam cap removed, and there is an oil squirter in its place.
Only the stock solid lifter cam is legal in the Rabbit GTI in ITB. That means no G-grind, no 1600 Rabbit cam, no Schrick 272, nothing but the stock cam.
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MARRS #25 ITB Rabbit GTI
SCCA 279608