How to add a flag to a table that looks up whether a value has changed across different rows

[Anonymous]

I have a table that holds the below data 

My goal is to determine if the dataIteValue has changed from the row that is listed as Original to the row that is listed as Restatement. I need to look up the dataItemValue for the "Original" and the "Restatement" and add a column saying whether or not they are equal to eachother. Each InstitutionID can have multiple filingTypes, periodEndDate, and dataItemIDs. So I think you would need to create some type of unique look up value that would concatenate the InsitutionID, FilingType, periodEnDate and DataItemID and then compare the dataItemValue between the two line. The goal is to determine if the dataItemValue is the same. Ultimatley, I want to filter this data as only the datItemIds that have changed for each institutionID, FilingType, periodEndDate, dataItemID combination.

Thank you for any help you can provide!