There are broad commonalities in Dzogchen with common Mahāyāna view; commonalities with Vajrayāna as well; but the perspetive of Dzogchen about the basis in terms of what is called sound, lights, and rays is unique to Dzogchen and not shared with other traditions -- though it is tempting to try and find connections.
OK, one last question...
When you read the following statement...
Chogyal Namkhai Norbu. Dzogchen: The Self-Perfected State (Kindle Locations 179-182). Kindle Edition.
But such a being may manifest a body through which others can have the possibility of being helped. The Body of Light, or the Light Body of a being who has realized the Great Transfer, are both phenomena which can be actively maintained so that those having the visionary clarity necessary for perceiving them can communicate with the fully realized individuals whose bodies find themselves in a dimension of pure light.
... You do not think this communication is the same/similar as what is experienced between a Guru and an advanced student?
Depends on the tradition, the guru, and the student.
Receiving shaktipat from a Kundalini guru, for example,or satsang with an Advaita, etc., or Dokusan from a Zenmaster has nothing at all do with a direct introduction from a Dzogchen master. They are not even in the same ballpark. Different principles, different practices, different experiences, different results.