RF-DG-52PAS is a USB dongle developed for ZigBee 3.0 application. The CC2652P dongle with SMA interface external antenna is usually used as a ZigBee gateway.
RF-DG-52PA is a USB dongle developed for the BLE, ZigBee and Thread applications. The CC2652P Bluetooth ZigBee dongle is usually used as a Hub or a home automation gateway.