Can you even "review" changes to spreadsheet code? I know that Office apps have some support for change management, but is it even up to this task?
Screenshot: https://support.content.office.net/en-us/media/9149c7e8-6f0c...
In the Excel Options dialog box, select All Commands under Choose commands from.
In the list of commands, scroll down to Compare and Merge Workbooks, select it and click the Add button to move it to the right-hand section.
That was my release workflow. Worked for the +30k line application I built in VBA.