PV portal change and keeping old data


Hoping this is a quick answer, my PV Solar portal (Solis) has changed to a new website and requires an API now to connect, I have setup the new connection and want to move over the Solar Generation on the energy page but when I do this I lose all my old data. Is there any way of changing the sensor and keep the old data that is already there? If I add both they will double count.

Thanks all,