Maybe the difference is in the audio-player?
I've noticed differences between Qobuz and Tidal, listening to either MP3 or CD quality tracks, which were supposed to be exactly the same versions (same year remasters of Wish You Were Here and Dark Side Of The Moon, for instance). (Depending on the headphones I used, Tidal either sounded fuller, or duller, stuffier... go figure. It seems to add extra bass compared to Qobuz and if the headphones are thin on the bass, it rounds out the music. Otherwise the bass becomes too much and becomes dull and bland. That's my analysis of the sound difference).
However the players are different, using the Windows Audio subsystem in different ways. This may cause the differences in sound, not any EQ done by the players themselves.
Now that I'm listening via Roon and a Jotunheim, I'm not so sure anymore that I hear a difference between a track streamed from Tidal or Qobuz.