This is from what SWIM knows (SWIM is not by any means experienced).

I have had multiple experiences with mushrooms, and with all of those I still felt that I ever left the physical world that we are "in" right now. Sometimes i felt like that what i was seeing wasn't real. from what I know enough DMT sends you into a completely different plane (universe) if you "breakthrough". So it would be similar, but on a completely new scale compared to mushrooms.