The kernel and RTCS generic code is the same. However, the IO drivers are different (KSDK versus MQX classic) due to different IO subsystem (NIO in KSDK).
The gprs example requires RTCS+PPP, which has not been ported to NIO, thus, the PPP/gprs example is not available in the KSDK version of MQX. For RTCS+PPP you have to use MQX classic.