944/968 Engine

[BAZZ69]

Hi. Im sure there is probably something on here about this, but i cant find it. What is the difference if any between the bottom end of the 944/968 engine. I know the head has the variocam. but is there any difference in crank and rods, ie lighter/stronger crank and rods in the 968 ??Can you tell the difference from looking at the outside of the block??
Bazz