It sounds the same because it DOES exactly the same -- assuming of course you have all processing, EQ, volume normalization disabled in both apps, and set it to download/stream Master quality in the settings menu.
Check
this post (and others) for details and evidence.
The reason is that both UAPP and the Tidal app have dedicated support for the hardware MQA in V30, so they both route it to the DAC in the same way with the same flags. I assume that is true for V35, V40, G7 as well, but I have only tested it on V30, so I could be wrong about those other phones. You can verify it on your G7 by inspecting audio_flinger dumps as described on
this UAPP support page.
Now, that's ONLY true when we talk Master/MQA tracks. Redbook 16/44 tracks are a whole other matter: They will be played through the Android Mixer path by the Tidal app, causing them to be upsampled to 48KHz. So there you will hear a difference. But Master/MQA tracks are generally 24-bit, which most apps (including Tidal) manage to play through the Direct path and offloadable, meaning they will bypass the Android Mixer and go straight to the DAC.
So we all still need UAPP anyway in order to play Redbook 16/44 tracks unmolested.