All Buddhas are One Buddha
The Avatamsaka Sutra boldly declares: “All Buddhas are One Buddha.” The Primordial Buddha (dharmakaya) manifests countless glorious Forms (sambhogakaya) and material Forms (nirmanakaya), according to the place, time, and circumstance of sentient beings.
However, this does not imply that such diverse Forms are generically identical. Absence of duality is not synonymous with identity. The Buddhas and Great Bodhisattvas are not identical in manifestation, and not different in essence.