The RF Receivers and Transceivers are designed for the various RF products. The modules look generally the same, but have different functionality based on the system and wireless device being used.
It is possible to have more than one RF Receiver or Transceiver mounted in a spa cabinet, if the spa utilizes more than one wireless device. For instance, a hot tub that uses a wireless menu panel and an RF Dolphin would require two modules. One module would be a receiver for the Dolphin. The other module would be a Transceiver for the ML990H.
