I've done a basic comparison between ' Psychonaught vs Curandero/ Shaman', to try and illustrate the differences : It's primarily about intention, then honing skills, IMV.

Curanderos/ Shaman's, (for the most part) have abilities because they have learnt and practiced 'skills'. However some Shaman are very similar to psychonaughts,(according to Endlessness)

So a psychonaught can be a certain type of 'psychonaughtic Shaman', but can't be the same sort as the skilled working ones, like an Amazonian Curandero, unless they practice those skills.