Correct, both recognition systems are (at this point in time) independent. The donor/passkey from "classical" F@H and the Google-based ID for the Android version don't know each other.
The concept is different: the Android version is based on streaming core, nothing like a WU as such exists which makes the time to participate the only measurement.
I run the Android client on a Nexus 7 from 2013 under KitKat. https://en.m.wikipedia.org/wiki/Nexus_7 ... version%29