I would be astonished if Polaris control arms fit and provided the same geometry as CFM arms.
Do you have a URL to the Facebook page in question?
Why would you be astonished? How much of a RZR do you think is actually made in the US? There is quite a bit of parts i have seen the can cross over. My guess is even the ball joints cross over but have not confirmed yet.
There are 2 different pages "CF Moto Z Force Owners" and "Zforce Nation". I posted a question about the SuperATV lower arms going discontinued and got the response and pictures of a guy mounting a RZR lower on the rear of his machine with no problem. But he says his machine is a 600EX. Im looking more for the 800EX/1000.
I have contacted Highlifter to see why there not in the market for these machines and if they would be willing to get into it or send some parts to try and cross reference. Waiting for a response.