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In some ways, yes, and in some ways, no. As for how they’re the same, propane and gas both burn via the same process, combustion, and at the same temperature, around 3,600 degrees Fahrenheit. The difference is that propane produces more heat per unit than gas. One cubic foot of propane contains 2,516 BTU, while one cubic foot of gas contains 1,030 BTU.

No, you shouldn't cap a gas pipe with a compression fitting because they aren't designed for gas lines and can pose serious safety risks. Gas pipes require threaded caps that create a secure, leak-proof seal capable of handling gas pressure. Using a compression fitting could lead to dangerous gas leaks—a hazard you definitely want to avoid. 

The easiest way to empty a propane tank is to simply use it until no propane remains. If you’re short on time and need a faster solution, transfer the propane to another tank instead. Wear leather gloves to protect your hands, then connect the hoses from both propane tanks and seal them tightly. Turn the knob to open the supply tank valve on the full tank and let it run until the pressure pushes all the propane into the other tank. When all propane is transferred, remove the hose and seal each tank. 

Natural gas companies advise only shutting off the gas supply at the meter yourself if you smell natural gas or suspect there is a leak, typically following an emergency. Instead, you can shut off gas to individual appliances when necessary. If you want to turn off your natural gas entirely, you should contact your utility company. You’ll generally also need to acquire a permit to work on your natural gas line.