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It would be a cool feature to make any value in a Revit schedule to display highlighted (and would print that way) to so what values have changed since the last revision. Maybe the schedule can freeze capture the fields to compare the new values and showcase the differences. Easier said than done but would be a great feature.
not in Revit, but you can export to excel (via delimited txt file) at project hold points, then find a compare worksheets tool.