Leave only differing cells

I have a file (table) and its new version with 11486 new rows and some changes to some of the existing 108408. How to delete same rows so that only modified/new ones are left?

New and modified rows are in the new file version? There is a date or similar data to discriminate between old and new rows?

There is a value unique to each row (e.g. name, part number) that remains the same in the changed rows?

Maybe Pivot Tables could help.

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