Atma means this body, atma means this mind, and atma means the soul. Three things, they are called atma. So Krsna's either body or mind or the soul, there is no difference. Krsna's body is avyaya. Our body is vyaya, it deteriorates, changes.
Lecture on Bhagavad-gita 4.6, Bombay, March 26, 1974