but for a pinch harmonic to work it must be over a node and if there is a node then a natural harmonic is possible
eg do a natural harmonic at the 5th or 24th fret then do a pinch harmonic over the 24 fret its exactly the same note isnt it (2 octaves above open string) because ur using the same node it doesnt matter how u get the harmonic to ring (pinching, conventional natural harmonic, tapped harmonics, harp harmonics) it will be the same note