It's not exactly the same but there's not much difference.
If Chelsea win the game at Stamford Bridge by 1 goal they're through, as opposed to it going to ET (1-0) or them going out (2-1 / 3-2 / 4-3 etc)
There's quite a substantial difference tbh
I didn't say it was perfect.
Simeone must still be happy that they didn't concede. Chelsea won't score many goals against them (especially if Hazard is out) and surely Chelsea can't park the bus at home. IMO 0-0 is better result for Atletico than Chelsea.