No Paul as I said not tech savy, they are what you advised I think ,they are both the same size. Have read the instructions but still not sure, you start with them both in the same room then it says move one of them to where the equipment is, then it talks about putting the wires in, I have no idea what it means or where to put the wires, all well if you are below 30 but if you are not used to tech its all a bit overwhelming, it would have been best to order the plugs and book an appointment with an engineer to help, I know you may think that is not required but sometimes it is.