Latest RC 2 Controller Firmware noted for Mini 4 Pro is different than that noted for Mini 5 Pro. I would expect that it would be the same RC 2 for both drone models.
When you change between mini 4 and Mini 5 drones on the RC2 the routine includes comments that firmware has been installed. I’ve not checked the firmware versions for my RC2 as I’ve not installed the latest updates so I don’t have the restrictions of the latest versions.