No, they're not identical phones, so don't use the ROM provided for the older Iron. New ROMs will be available for the Iron Pro later. That's just a freshly released product of UMI.
Now I got a reply from UMI that promises an update firmware via Rootjoy in a week from now. So, I suggest you to frequently check in Rootjoy if UMI Iron Pro and a new ROM is added in the devices list.