[rharb]

It doesn’t. Especially in this case, because lichess doesn’t even use elo ratings. It’s a different rating system altogether.

https://lichess.org/faq#ratings

[thethirdone]

Chess.com also uses Glicko. Though it might be version 2 on lichess and version 1 on chess.com.

[_gz]

You're right about the versions, they also have wildly different starting values and very different player pools (I'd argue that more beginners play on chess.com), so you'd expect a substantial elo difference between websites