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I was going to list the stroke as well, but wasn't 100% sure I had the numbers correct.
Per the factory work shop manual:
2.5 Crank: 78.9mm stroke (39.45mm throw from crank center line)
3.0 Crank: 88mm stroke (44mm throw from crank center line)
If you can tell a 9mm difference in stroke when looking at pictures of 944 cranks, then hat's off to you!
Actually its not too hard to tell the difference in pictures if the pictures are from the right angle.
The place to look is the ‘overlap’ between the main journal and the rod journal – on a 3.0 crank there is very little overlap.
1st pic is a 3.0 and the 2nd is a 2.5 – look at the rod to main journal relationship……once you see it you can tell them apart at 20’