You can find this information in the about section of the Go4 app while both controller and aircraft are on and connected.
Generally they should match, but not always necessary. However, recommended.
I am a mavic 2 enterprise user and updated to latest firmware via DJI Assistant 2. Upon successfully updating I lost the ability to see my camera feed while utilizing an iOS device. I still was able to see the telemetry and take pictures and video - it could only be viewed in post however. It was then (lesson learned) I checked the mavic forums and learned to not upgrade if using iOS and DJI's official line was to get an Android. While DJI said the firmware upgrade was non-reversible, I was able to downgrade to a previous version, after trying for several days, and all is well. I had also upgraded my controller firmware without issue. However, I get a warning upon startup that my device and controller are using incompatible firmware - everything still works well though, just have to decline upgrading.
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