My SDS-XLR has the same issue with two identical umbilical cords with connectors of the same type on both ends. I have not had any problems connecting them correctly but I sure as hell do think about it every time. I have the proper placement written down and a note in my wallet even so if I am at a meet or something I wont screw it up.
My Doshi preamp has two power supply umbilicals but they are completely different types and they only can be attached in one direction because of male/female or different pin-outs on either end unlike Mikhail's which can be plugged in either way on either cable. It would be easy enough for him to do something to identify them or for the owner to do so, but it should probably be there in the first place. I don't have such a strong reaction to it as some of you do, but it would be the kind of thing expected from a professional, commercial product.