Is the RC12YC the same as the QC12YC spark plug?

The RC12YC and QC12YC spark plugs are similar but not exactly the same. Both are designed for small engines and have the same 14mm thread diameter and 3/4" reach. However, the RC12YC has a copper core electrode while the QC12YC has a platinum core electrode. This small difference can impact the spark plug's performance and longevity in certain engine types.