There is no duality in the Absolute platform. That's a fact. But that does not mean that realization of Brahman is the same as realization of the Supreme Personality of Godhead. That is not the same. There is no difference, so far the spiritual identity is concerned. The spiritual identity is the same, Brahman, Paramatma or Bhagavan. But because my realization is imperfect, therefore somebody says that Brahman realization is the supreme; somebody says that Paramatma realization is the supreme; somebody says Bhagavan realization is the Supreme. But factually, one who has got real realization, he knows the Absolute Truth is realized in three features, according to one's capacity. The Absolute Truth is one.
Lecture on Srimad-Bhagavatam 1.2.25, Vrndavana, November 5, 1972