As far as I can see the main difference us the combustion chamber shape its smaller on a 4x4. And the temp sender is in a deferent place but as far as porting is concerned you can poet them the same

Although I will add that there has to be a reason for the change in combustion chamber shape on the 4x4 one


Manu because the transfer to unleaded or the emotions

Also as far as I can find out the 4x4 head has better cooling and oil feed to the turbo