Hi Ron,
Answer; maybe or maybe not
I have 2 WL.com stations: KomokaWeather updated by WiFiLogger, and KomokaWeather Live from my WLL device.
I have one pro subscription. From the WL.com site I can use the Device Tier: tab to downgrade my KW Live station which leaves one Pro subscription available, then upgrade KW to use that Pro subscription. Then do the opposite whenever I want, and however many times and whenever I want, but only one Pro available at the same time.
I usually have the KW Live station as the Pro so that my CumulusMX using the WLL will have access to 5 minute historical data catch up. Historical data is not available from WL.com for 3rd party programs catch up with the basic account, but my CumulusMX with WiFiLogger has its own logging so doesn't use the WL.com data for catch up.
Enjoy,Paul