Not exactly no. Think of it like a stock car while the AIB's (sadly slowly not anymore) are tweaked "racing" models. EVGA was the prime example of this where they would tweak their cards faster than stock.

The stock car is fine and probably cheaper but that racing model will be faster and have things like NOS and bucket seats.

Also the company that covers your warranty for AIBs are those companies and not NVidia. The direct car example would be if your dealership would repair your car for you as per warranty instead of the factory it came from.