How would your elo compare to your OTB elo? - Chess

I have never played an OTB rated game. However I want to. So I was wondering how would one's elo on translate to OTB elo?In the sense that would (on an avg.) be the OTB elo of a 1500 elo player.I know there is no concrete answer to this as it will vary from player to player. However

Is winning 3 games out of 11 against someone 600 points higher

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Rating difference between LiChess and Chess.com is about 100