Hi
There are two connectors from the M32 board to the little sub-board (fixed to the case) that does the power in and audio out.
One is a 2-pin power connector (black/green wires) and the other is a 5-pin audio connector (white, black, violet, blue, green wires).
On the underside of the M32 board, the 2-pin power connector is marked as P1 and the audio connector P3.
The sockets on the ends of the cables should only fit one way round and they won't mate with anything else on the boards so you should have no problems.
I have 3 Mother 32s in my 9U 104HP Eurorack case and the problem I have is finding the money to fill up the rest of it!
Steve