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Consult an electrician. Don't get advice from a car forum.
Neutral and ground are not the same. They are not to be connected together except at the circuit breaker box. To do so will defeat the purpose of the ground and affect safety. It will violate code.
Four pins may be required. If the stove has a 120 volt outlet or some other 120v function, then you need the 4 pins for proper operation.
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