Usually, the boxes must match (meaning manufacturers). I have used the Airtronics and Futaba setup and both needed compatible cords to connect the two.

The club trainer that I bought a while back came with a basic four channel Futaba system installed... it was an RTF. I already had a Futaba buddy box to mate with it and, of course, it worked just fine.

I don't think you can mix and match, but I could be wrong.

CGr.