No, one sharing key can only be used with one feed at a time. If you want to share data from more feeds, then you need to register more sharing keys.
Do note that you can register up to 3 keys under the same account yourself. If you need more keys then you can contact us and provide us with the following info for creating more keys for you.
- email address
- coordinates in decimal format.
You can of course use the same sharing key if you are redoing your setup or setting up a new Pi while the previous one, for which it was registered, is no longer operational.