I know whats going on here. Your manual probably said that normal will fit once it has the correct button head. Or its talking about another motor. Sometimes they have 2-3 motors in a manual. Look around youll find one suggesting a turbo plug im sure.
As for the plugs. The standard glow plug has a copper gasket. A turbo is larger and has no gasket.
Get a turbo plug. Thats all you need.