Not really understanding the questions, perhaps a language issue.
If I was moving to two new boxes with different hardware, this is how I would go about it-
Backup config on both old boxes.
Shutdown old backup and remove from rack.
Rack the new master and backup.
Restore the config from the old master onto the new master, adjust interfaces, etc.
Restore the config from the old backup onto the new backup, adjust…
Verify the new units are now showing any errors.
Shut down old master.
Move connections to new master and backup.
Cycle provider equipment.
Test inbound and outbound connections.
Get a beer.