You can run reports that return information about pay zones and pay zone differentials in Reporting and Analytics > Reporting > Reports. See the Ad Hoc Reporting Guide.
Employee Details - Payzones
The Employee Details - Payzones report evaluates the pay zones hierarchy to determine which zone is assigned to an employee at any point in time. This report initially returns all pay zone-related employee data, which can then be filtered based on any attribute in the report.
To run the report, select Employee Details - Payzones in the Human Resources category of Reporting and Analytics > Reporting > Reports.