According to the Champion plug web site they are both bantam height. But a different bantam height. I ran into this and found that the plug looked different where the wire connected and sealed t the plug and that was the only difference.
Champion Spark Plug Co. is currently owned by Federal-Mogul.
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Champion RCJ6Y
This plug is the Champion RCJ7Y.
A sp-34 spark plug to a Champion plug is a small engine spark plug. They can be used for lawnmowers and weed eaters among other things.
Champion Spark Plug QC12YC
Champion J6C
If you damaged a Champion RJ19HX spark plug, then you can indeed replace and substitute that with a Champion RJ19LM spark plug due to the similarity in their sizes.
ngk Bm6a its the same plug
The RC14YC in a hotter plug.
GAP .030"