Psychotherapists and researchers have founded that different kinds of psychedelics have different treatment significance since they can make different effects.
Regardless, it is unlikely that ketamine, psilocybin or any of these psychedelics would be used directly, because of their hallucinogenic and other side effects.
But ketamine is not alone among psychedelics in having potentially therapeutic effects.
For the psychedelics are a powerful, even a shattering experience.