I assume, you mean SmartNora and not the old Nora.I now have Nora running for five devices. If I install Google-SmartHome on a separate Pi, will these two work in parallel?
Do they work in parallel?
That will depend on the names, you use.
You can't have e.g. two Switches, both called "Switch" in your "Living Room", but you can have "Switch1" and "Switch2" in the "Living Room"
If you are satisfied, you can delete the SmartNora "Switch" and then rename the other "Switch".
Regards