“Non-duality” in Buddhism versus “Non-duality” in Advaita Vedanta

“Non-duality” in Advaita Vedanta is completely different from “non-duality” in Buddhism because the former is discovered through Samadhi, while the latter is discovered through Vipassana. The essence of “non-duality” in Advaita Vedanta is nondifference of subject and object, and the unity of Atman and Brahman. The essence of “non-duality” in Buddhism is neither subject nor object of “awareness” (or “consciousness”). That’s why Buddha didn’t attain enlightenment after achieving the fourth jhana and even the highest formless jhana, until he realized the role of Vipassana six years later.