Is it possible to achieve the same quality with the mobile phone and interface / microphone as with the laptop and interface / microphone?
Yes, but the program probably doesn't offer that good options… How do you even want to connect the interface to the mobile phone?
It's easy to do with this part:
Apple Lightning Digital AV Adapter https://www.amazon.de/...009WHV3BM/
What do you think of GarageBand?
You can also mix with EQ and Compressor in GarageBand, and reverb, I actually never need more. Otherwise you can simply transfer the files to the PC and mix them there.
What bothers me is that you can only have 32 tracks.