Given the lack of responses, I will jump in here... However, you need to know that I have never used a Reef Octopus skimmer.
This seems to me it is basically, a situation where you do not know until you try it. You will need to know what the fittings on the old (or current) pump are, and how you can adapt those to another pump. I would think the fittings would be standard, but with these large manufacturers it is hard to say exactly.