This is not safe advice and can result in someone getting shocked in the future. Please do not suggest users violate electrical safety code.
While everyone thinks of all Netral wires being equal, since they land on the neutral bus bar in the electrical panel, they are very unique to the circuit they are paired with. AC current flows through the Neutral wire just as much as it flows through the Line/Hot wire. When a circuit breaker is de-energized, a properly wired circuit's corresponding Neutral will have no current flowing on it. If you steal/borrow another circuits Neutral, there can/will still be current flowing on it. This can lead to someone getting shocked/electrocuted when working on what they believe to be a de-energized circuit.
Also, using another circuit's neutral requires that neutral wire to possibly carry too much electrical current, posing a fire risk. Two breakers sharing a single neutral can easily overload that neutral wire causing it to overheat and start a fire.
Please don't do it.
