Just wondering what the difference is.
3 Answers
I may be a little rusty on this, but I believe that "Successfully Installed Updates" mean that the scripts run successfully, and the patch is installed. The status becomes "Compliant" after the update agent processes/verifies the state of the update.
It may take awhile to see "Compliant", depending on how often you run inventory, and how many mobile devices that you have. (ie. Off-network devices may not run inventory scans)

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Compliance category provide the best interface for finding the software updates that are required on client computers.
Successfully installed- updates installed on client computers.

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Successfully Installed is self explanatory. Clients which are compliant with updates, may not necessarily have them installed if the updates were not applicable to them.

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