There is not a standard report or simple inquiry that can be performed to see all versions with overrides. The easiest way to determine this information would be to look at the F98761 table in the central objects data source and find all records with a specific version name that have record types other then just 1. This would indicate some type of override was performed on the object. Depending on the value in the record type field (RSRCRDTP) you can determine what type of override exists for the version.
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