The manual for the 2.4 master should tell you what buddy boxes can be used. It varies somewhat from radio to radio. For instance, Futaba's 6-channel FASST radio has a shorter list of acceptable buddy boxes than their 7-channel one does. So the answer to your question is yes, it can consist of this combination, but that doesn't necessarily mean you can use any Futaba FM radio as the slave with any Futaba 2.4 transmitter.