SharePoint List Column Comparison

New Contributor
I am looking to highlight the field when a user makes a change to the field in a SharePoint list.
I have imported the data into the list in duplicate and then hide the column that is being referenced to check for changes to the column that the user can edit. I am trying to use the JSON below but it doesn't  seem to pick the  [$Control_11] column reference correctly when doing the comparison. 
Would anyone have any ideas as to why this is.  
Essentially I am just looking to compare two fields and highlight one field if the are different. 




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