Sorry, but it's not the same thing.
Because a car air conditioning system has to accommodate the movement between the compressor, which is mounted on the engine, and the other components which are fixed rigidly to the chassis, flexible rubber pipes have to be used.
Over a period of time, the aircon gas can and does permeate thought these flexible pipes out into the atmosphere. This obviously causes there to be less gas inside the system so, after a period of time, probably several years, it's going to need regassing.
Your home fridge/freezer doesn't use any flexible rubber pipes so, unless it becomes physically damaged, never needs regassing.
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