rathy, as stated, that is what it would say in any spark plug suppliers book.
they would also have platinum tipped spark plugs as the replacement.
tuners will generally swap the spark plugs back to a standard plug for greater surfave area on the tips.
gap them down(ive run 0.7mm in the past) and tune accordingly.
there is also a debate on the best coil packs.
any new set will generally creat a better spark than your 20yr old set.
alot seem to think brand new nissan to be one of the best.
you pay with blood for these, so alot dont care for them.
there could also be other reasons for dropping a cylinder.
get it checked by your mechanic.
good luck, and keep us updated.