In Assure, you can use Multi-Capture Control Points to compare control data of a Control Entity to File Data you're capturing with the Control Point. You need to make two separate capture sources -- one for the Control Data and one for the File Data ( see screenshot below).
In the Control Data Source, you'll need to select "Computed" as the Type on the Source Tab.
Then, select how you'll be grabbing History (if you're unsure, use this article: Retrieving History Data (Control Data) in Infogix Assure) and make any modifications to the files (for example, you can Sum the values you grab). Once you've done that, you'll need to go to the Extract Tab and assign the Control Data values to Control Entity fields.
Then, set up your file extract as you would normally in Assure (make sure they're extracted into different fields than the ones the History Data went into!) and in the Validate Tab you'll be able to compare the fields as you would any other field comparison.