Well, the BPC was designed a bit differently, so it has eight outputs, but only two power inputs. The SC2 simply has six relays with 15A capacity. With the SC2, you can have any combination of power to the sidings from one supply for all to individual supplies for each siding. The only thing you have to do to use the first channel freely is to cut a ground trace that was put there to make connecting switches easier. One slice and it's all fixed, see below. 
