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RN12YC and RC12YC are not interchangeable. The "R" in RN12YC signifies a resistor plug, which helps reduce electromagnetic interference. The "C" in RC12YC denotes a copper core plug, which provides better heat dissipation. Using the incorrect type of spark plug can lead to poor engine performance and potential damage.
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I have interchanged them and it seems to work.
Everything is the same apart from the hex wrench. The hex on the RN12YC is 13/16" (20.6mm) and on the RC12YC it is 5/8" (16mm).
Because of the body size, heat retention or dissipation may make the difference.
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