I already did a comparison on my site (bottom of the page) and the result is :|
- on bPRO UART4 replace UART3. By the way, UART4 RX is also connected on bPI but not TX.
- PIN 7 & 12 are swapped.
Otherwise, we have only some added PIN only used on bPRO for additional IO and obviously the WiFi circuit.
So, for me, providing those PINs are keep "flying" (not connected to anything, duno how to say that in English ), and as long as we don't use this UART and PIN 7 & 12 ... bPRO's FEX seems to be usable on bPI.
Can you confirm ? (I don't want to burn one of my card )