OK Guys, I have an interesting situation. I currently have a 15 yr old Raypak 406a P-M406A-EN-C natural gas that needs replacement; it fires up properly but the firewall is so old it overheats. Here's the situation - I've found a professional series 409a that is propane B-R409A-EP-X. Would I be able to swap out my existing NG orifices and NG gas valve regulator onto the professional series propane version? Are these the only items that would need to be changed for a conversion or is there more to it?