I have made an adb backup of my OnePlus One running an unofficial CM12 ROM based on Android 5.0.2. Is it possible, considering the latest release of Android for the Nexus 5 is 5.0.1, to then restore this backup onto a Nexus 5 running 5.0.1?
You may be able to restore apps and data as far as they are no system apps. But be sure to fix permissions (Owner, Group and access) to what the system uses for all files (data and apps).
I already did this on my SIII LTE for an upgrade of Android 4.4.4 (CM11) to Android 5.0.1 (CM12) with no side effects (except some single apps that deleted and recreated their data for some reason).
Also: Of course your device needs to be rooted to be able to write onto the