is natural gas propane gas
The comparison of propane vs. natural gas is widely used in applications for vehicles and residential fuel supply. Also, while propane is stored as a liquid, natural gas can be stored as liquefied natural gas (LNG), compressed natural gas (CNG) and in its uncompressed form, which is just referred to as natural gas.
Natural gas is a much lower pressure gas than propane and converting the appliance to one or the other gases requires that the differing pressure is compensated for. In other words, connecting a natural gas appliance to a propane piping system will result in appliance malfunction and possibly danger. The reason for this is because natural gas orifices are larger than propane orifices strictly because of gas service pressure.