2nd vs 3rd gen rear axle shock brackets

Just picked up a set of Rago Fab shock skids on the BST for a 3rd gen, believing that the 2nd and 3rd shared lower shock mounts, and noticed Rago has two different part numbers on their website. I've studied the review pictures but can't really see much difference between the two. Can anyone point out the differences in the two generations' shock mounts?

 

Pictures are the same. No dimensions are given. So unless there are dimensions that are different...........

Why not call and just ask what the difference is between the two P/Ns?

Also they look simple enough to install. Try one and see if it fits. Can't see how that would mess up anything.