Differences between parts

Question

Can you tell, are there any differences between the following:
968 and 944
head
rods
pistons
cam

thanks

Answer ?

The head and bits of the 968 are all new parts and this is where much of the power increase over the Porsche 944 S2 comes from. The 968 head has Variable valve timing (Variocam) lighter pistons and con rods and also has redesigned inlet and exhaust manifolds with all of this there are also new camshafts.