Can anyone explain how equity realization works in those specific spots?:

3bet pots in position as coldcaller
3bet pots in position as 3better
3bet pots out of position as caller

Assuming we are equally skilled as the opponent, i understand we realize more vs weaker player and less vs better ones.

Im looking for an approximate guideliness, for example if we defend IP in 3bet pot, we realize X % off the pot