You are absolutely right!
I installed new NGK plugs for a B18/20 into my freshly rebuilt B16. I could swear they were the same...but,
The car started missing after a few miles.
Couldn't figure out what was wrong, never thought it would be the plugs.
Pulled the plugs and found that there was no gap on one. Hmmm, I thought, how could I have missed that! Re-gapped it, installed and went through the same drill.
Yes, the plugs are different.
Fortunately, there was no major damage. I could see where the plug was hitting the piston though.
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