Aldila RIP Phenom 80 Tour X-stiff v. X-stiff

I was just wondering if anyone knows what the difference between a tour X-stiff and an X-stiff RIP Phenom 80 shaft that comes in a 913Fd. I've tried looking everywhere but still haven't been able to find anything. Thanks for your help in advance.

It would also be helpful to know if the tour X-stiff shaft was built for a higher swing speed.