I have done a lot of research but haven’t found such migrate/upgrade document. For migration, we may need to remove and re-install the NDES service, then configure the NDES service, install and bind certificates on the server that hosts NDES and install the Microsoft Intune Connector with the following guide.
https://learn.microsoft.com/en-us/mem/intune/protect/certificates-scep-configure#set-up-ndes
https://social.technet.microsoft.com/wiki/contents/articles/9063.active-directory-certificate-services-ad-cs-network-device-enrollment-service-ndes.aspx#Upgrade
Also, if you make configuration changes for NDES or to the certificate templates that are used by NDES, you must stop and restart NDES, IIS and the CA service.