u/Axten-89

Hi all, so I am completely new to 3d printing and my question is, I want to upgrade my nozzle from a 0.4 steel to a harden steel, but, what I don’t understand is in the slicer the nozzle is set to 0.4mm, but the profile is 0.20 standard, so does this mean I’m not actually printing at 0.4mm but 0.2mm? If so I’m better off just buying the 0.2 HS nozzles right? Because there is no 0.40 standard profile in the slicer, biggest is 0.20?