Ask HN: Service to compare large files

Would you use a service to compare large data files for you? This is to check that a code change which SHOULD have no effect on the data (refactoring or performance improvement) doesn't have data impacts. You would submit two data files: one generated using code before the change, and the other generated code after the change. If there are differences, a report gets generated that quantifies them. You get the results in a few hours. Let me know your thoughts.