A tool to compare 2 Excel files

I need a tool that Compares 2 Excel files with many sheets The excel files are extracted from my database, so the user should be able to precise for each sheet the primary key (for example: using another excel file registered in the hard drive) The tool generates a report saved on the hard drive and displaying the difference between the files based on the primary keys. In the report there’s a case where the user can flag each line after analyzing the difference as ”OK” Once the user runs again the tool, it’ll compares another 2 files based a previous report (and the primary keys) and the differences flagged as “OK” will be reported again in the new report (of course if they exist as a difference in the new comparison.