i believe the only tx rx that would be close to compatible is if you had a jr tx i think the newer tx's are set up to bind to the spectrums  but you would have to buy a decoder and install it in the tx of a spectrum to use it with a jr rx. im going to say no your radios and receivers are incompatible unless the use the same tx so yes you probably will have to get another rx and install it . easiest way to find out is select another model # in tx that is blank and try to bind it.