For what is worth BUHW-2 is the equivalent of L78V
The nearest NGK equivalent of QL77JC4 is BZ7HS-10
If you are forced to use NGK plugs take care not to use a resistor plug.
BR7HS-10 is not an acceptable alternative in an OMC CDI system despite the fact you'll often find it quoted as an equivalent of QL77JC4