Ksc/kwa will run on propane out of the box, on 95% of the models I've seen.(and I only 95 because I can't guarantee there isn't one model that doesn't like propane) Trades are the only difference I've ever seen. System 7 and ns2 are essentially the same system.
They are marketed for different countries, hence the trades difference, and the countries' fps laws are different, so that's marketed differently as well.
I'm fairly sure that they are basically different subsidiaries of the same company. Like future shop and best buy
