[Freesurfer] Corresponding coordinate in fsaverage?

Hi, I am trying to find the corresponding coordinate of a vertex in lh.pial in fsaverage space. I manage to transform lh.pial in fsaverage space but this does not give corresponding points or a way to do point by point transformation.

I want to do the same with some vertices from lh.pial-outer-smoother. Trying to transform this with mri_surf2surf gives an error because obviously there is no registration of that mesh. Any idea if this can be achieved at all?

Last question: am I correct assuming that the surface to surface registration (sphere.reg) does a better job at matching gyri and sulci on fsaverage than the simple conversion in MNI305 (aka fsaverage): MNI305RAS = TalXFM*Norig*inv(Torig)*[tkrR tkrA tkrS 1]'

Thank you. Dorian