most people tap 12 frets above givin the most basic harmonic,
when u pinch harmonic u normallly hit a very harmonic, giving it part of its sound.
so if u tapped in the right place i recon u would get a pretty similar tone.
the logic for this is alos i once tried using pinch harmonics 12 frets above the frettted note and it was similar to a tapped one.
at least i thought