What happens when i Replace my GX-Device in my VRM Account

Hi Gents,
so i replaced my Cerbo Box in June, because i had some serious stability issues with the old device which even could not be solved with a factory reset. Since June i have a new Cerbo and also a new VRM Portal-ID and a new VRM Installation.

This morning i saw, that i can replace my cerbo box in the VRM Settings of the old installation.

What exactly happens if do this? Will the old VRM Installation continue to run, but with the new Cerbo box and merge all the data of the Old and New Installation?

If you move the GX, it will use the new gx to log to the old (replaced) site.
But will stop logging to the new one. (The one it is currently one)
It won’t migrate what has already been logged on the new site.

Many Thanks!