It's not as pleasant as working with plaintext, but Spreadsheet Compare is a nifty tool for diffing workbooks: https://support.office.com/en-us/article/Basic-ta

It's not as pleasant as working with plaintext, but Spreadsheet Compare is a nifty tool for diffing workbooks: https://support.office.com/en-us/article/Basic-tasks-in-Spreadsheet-Compare-F2B20AF8-A6D3-4780-8011-F15B3229F5D8 https://support.office.com/en-us/article/Basic-tasks-in-Spre...