The Banana Pi is made to be compatible with Raspberry Pi accessories. This is of course in relation to boards that are attached directly.

The GPIO layout of the M1 Banana Pi is identical to the Raspberry Pi Model A and B (classic). That means that boards such as the PiFace command and control will directly fit on the board and function just as if it was connected to a Raspberry Pi. The Banana Pi boards have a different layout than the Raspberry Pi boards, which means that you can't use your Raspberry Pi cases for the Banana Pi and vice versa.