The teaching about the living Buddha found in light beings and bringing enlightenment to human beings seems identical to the teachings of the Cosmic Christ, who is present in beings of light and brings enlightenment to humans.
Perhaps we can, borrowing from today’s science, distinguish between light aa wave and light as particle. As wave, both the Cosmic Christ and the Buddha Nature extend everywhere and permeate all beings. As particles, the historical Buddha and the historical Jesus were particular people from particular cultures operating in a particular time period. Thus the light of the Buddha and the light of the Christ have both wave and particle elements to them. As do we who share in their light. (One River Many Wells; Matthew Fox)