This is more specific toward the progressive press versions with the linkage attached. Just looking at them, they look damned near identical. I've got green all over my bench and am in need of another powder measure with the linkage. I'm just wondering if maybe I could use the linkage from Hornady on one of my existing uniflows.

Anybody have both that can measure the mounting holes for the pivot arm?

I have the Hornady LNL A P, have never had an RCBS progressive press. I do remember reading a thread on another popular PNW gun site about the matter and they mentioned that the powder measure linkages were both identical. I did a comparison online and they do appear to be the same. YMMV