Bhagavad Gita 2:22: ''Just as a man casts off worn-out clothes and puts on new ones, so the soul casts off worn out bodies and enters others that are new''
Moksha is difficult to comprehend as it is nothing like anything we have experienced before. There is nosuffering of any kind. Many believe it will involve everlasting bliss and inner peace.
When the atman reaches liberation and returns to Brahman, it always remains separate. It can never be totally the same as Brahman because Brahman is supreme, beyond human understanding and complete.