9c radio, Jr servos????
No problem, we mix up makes of servos with other radios all the time. The only rule you will need to follow where you live is that you can't use a JR receiver with your Futaba transmitter, you will need a Futaba or other shift compatible receiver. The sockets on the Rx will be for Futaba plugs which have a small polarisation tang on one edge but the JRs do not and will plug straight in, just make sure you plug them in the correct way around since there is no polarisation device. Where the Futaba servo white wire went in is where the JR servo orange wire goes in, Futaba black to JR brown. Plug the servos into the receiver in the usual Futaba sequence. Your existing programming will not be affected.
Harry