What happens after liberation?

I received the following question: “I have read the sutras by Edwin Bryant and there is a concept that I don’t get. How can the individual soul, atman, be differentiated from another one, if the two beings were both illuminated? It seems to me that souls are distinguishable because of the imprints (karmasaya) they carry from life to life. Do the souls of jivanmukta “blend” together in some kind of cosmic Soul?”