Did Buddha teach that the many was real and the ego unreal, while orthodox Hinduism regards the One as the real, and the many as unreal?" the Swami was asked. "Yes", answered the Swami. "And what Ramakrishna Paramahamsa and I have added to this is, that the Many and the One are the same Reality, perceived by the same mind at different times and in different attitudes.
Swami Vivekananda (2015). “The Complete Works of Swami Vivekananda”, p.3717, Manonmani Publishers