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The J19LM and QJ19LM are Champion brand spark plugs used for garden machinery. The difference between them is their resistors, the J19LM use a regular resistor while the QJ19LM uses a CDI resistor.
Rj19lm
Champion spark plug RJ19LM is for lawn mowers or similar equipment. The standard gap is .030 inches or 0.76mm.
Champion RJ19LM
Champion rj19lm
Resistor
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.
Champion RJ19LM will work.
yes
RJ19LM Champion
Rj19lm
Champion RJ19LM