Transfer Client Certificates (ClientAuth_CA.scc , ClientAuthentication_CA.pem) for (windows + Android) from another XG

hello

We have 2 different XG   (450, 330) in two separate locations ,

when users move from location A to Location B they have to import ClientAuth_CA.scc of that location to access internet on their android mobiles.

is there is way to unify the files (ClientAuth_CA.scc , ClientAuthentication_CA.pem)  on both XG so android and windows clients work on the 2 XGs without re-import the client certificate each time ?

Or I can generate new self-signed certificate and overwrite the two of them (Captive Portal works this way).

Note:

we don't want restore full back up because the XGs are different.

thanks