From their earliest history, Hindus believed that the soul survived the body and went to either a place of pleasure or one of torment. For the soul is eternal and indestructible. It can exist in any living form, whether human beings, animals, plants, or even in gods. Basically all souls in all different life forms are alike.
Souls are souls.
They do not differ in nature, regardless the life form they possess. The jiva is the manifestation of Atman-Brahman in Creation. The Atman alone is the real, immortal Self. And it is the Atman that stands behind the jiva. The Atman is Universal, and the jiva is an individualized particular.