You can't read .cal from the unit , at least not all ID just part of it so will make no sense to load it back as willbe not full.
Im Endeffekt ist Kalibrierung und Konfiguration ein und dasselbe, es ist aber einfacher zu unterscheiden.
No is not same... .cal is cal and config is what you can set up(via arduino) and see in diagbox..... none of the zone ID are same in .cal and conf
here what we have in w4 as cal