Except for that the Redmi N7 has a smaller and older battery, and that that stock "has to go" so they are not going to charge much anyways. Plus you probably get an OEM battery and not the original, which may mean worse capacity/quality or just cheaper in general because "it's not original"
I also use Zerotier for such cases. Not sure if you can somehow limit the ports they see, but works great in general