I think each model is talking about the same thing.
What Tolle calls Presence, IFS calls Self.
What Tolle calls Ego, IFS calls Protectors (Managers and Firefighters).
What Tolle calls PainBody, IFS calls Exiles.
The commonality is in realizing that Ego/Protectors and PainBody/Exiles are not your core You. They are subsets of You.
The commonality is in stepping outside of, stepping back from, asking these parts of you to step back from you, in order to find the Calm Core, the Peace that Passes All Understanding, the Joy of Being.
It is there. It is you. It is yours for the Being.