Yea, lots of manual steps:
https://identitydude.com/2018/06/08/duplicating-your-production-aad-connect-sync-rules-on-your-staging-server-using-the-aad-connect-helper-module/
Personally :)
I would upgrade the current server to the latest version and keep it in staging mode.
Then export out the config
then import to the new server and make that active.