In general, Sonos doesn’t do any ‘leveling’ of inputs, so if different sources have different ‘levels’, Sonos will reflect those levels. You’ll especially see this with TV inputs, as different ‘stations’ have different levels (and frequently play commercials at higher compression/volume), but Sonos doesn’t do any automatic ‘leveling’. 

Spotify, for example, is much lower than Amazon in my case. 
And plying Amazon, Atmos tracks are louder that the rest