Dearest Gurudev, are there any correlations between Kato Upanishad and Bardo Thodol of the Tibetan Buddhist tradition, or are they two different ways to approach death?
Kato Upanishad is an ancient text. And His Holiness Dalai Lama himself has said, "We consider Hinduism as the mother of Buddhism and it is through that that we have got our Tibetan Buddhism".
So, it is from Hinduism that Buddhism has branched out, and this knowledge is only a branch of Kato Upanishad.