They could be derived from different masters, though, in which case it would easily sound different. The only proper comparison of this stuff is to take a lossless file, convert it to 320 kbps MP3 with a program like dBpoweramp, then do a controlled listening test. (This can't be done with online streaming.)
I spent tens of thousands of dollars on music (mostly CDs) and kind of wish these high quality music streaming services existed long ago.
Spotify Premium: $9.99/month. 320 kbps. Over 30 million tracks.
TIDAL Premium: $9.99/month. 320 kbps. Over 40 million tracks.
TIDAL HiFi: $19.99/month. Lossless. Over 40 million tracks.
If Spotify seems to have a larger library, it's only because it happens to have more artists you were looking for.
Both of them are an insanely good value compared to spending so much money on each album via other mediums. (CD, vinyl, downloads, etc.) I mean, it's only the cost of an album or two per month, and you get to listen to countless albums.