I am using 1.3 and haven't ever found a 1.4 board available. I think it has maybe one more position for a socket. If you are using the typical Banggood transmitter modules 1.3 works perfectly.
Deviation Devo7e 3way switch mod, A7105, NRF24L01
Devo6s 2x2 switch mod, trim mod, haptic, multimodule, A7105, NRF24L01, CC2500
Devo12e 4-in-1 with voice mod -- it speaks!!