Propane and natural gas stoves have different fittings that regulate the amount of gas that feeds the burners. The jets for the propane are smaller because it has more energy and burns hotter than natural gas. Most modern gas stoves have the fittings for both types of gas.
Natural gas is mostly methane. It sometimes has small quantities of other gases, such as propane and butane, in the mix. This gas is transported to homes via a network of underground pipelines and remains a gas from its production until it reaches the stove.
Propane, also called liquefied petroleum gas, or LPG, is a petroleum product that is sometimes found near natural gas deposits. It is stored in pressurized tanks and as long as it is kept at room temperature, remains a liquid. Propane is delivered to homes and stored in an outdoor tank. Once it leaves the tank, propane changes to a gas.
Both stoves require an ignition source, either a pilot light or electric igniter, which must be properly adjusted for each gas. Burning both propane and natural gas produces carbon monoxide, so both stoves require adequate ventilation to operate safely. Installing a carbon monoxide monitor, which works similar to a smoke detector, is wise.