I think only the "Mobil choke" versions were interchangeable. Back in the day franchi, beretta and benelli used the "mobil choke" system and were interchangeable, I think.. I'm not sure about later versions with crio plus chokes, but I'd bet not.

If someone doesn't answer soon a simple call to any of the aftermarket choke manufacturers will earn you an answer.

 

Briley: Choke tables

http://www.briley.com/benelli20gauge.aspx

The Mobil chokes are interchangeable the crios are not.

 

Thanks John H. for your link. That is good to know because I have a 20 gauge Beretta 391 that uses the Mobil chokes.

Tulsajim