Originally Posted by Emmerich

If they are like grills, all you need to do is change the orifice if you change gas. Its mainly due to the pressure difference. I ran a propane gas grill on natural gas with no mods, it just makes the flames look weak. You need a bigger orifice for the natural gas. A drill can handle that chore. Going the other way might be more exciting if you put high pressure propane in a larger natural gas orifice.

You are not dealing with propane though, but LPG is also a liquid in the tank, like propane is.