Hello @Zaw_Win_Htun1
After Reading the Data from Excel use an Assign activity and use the below LinQ to get the Miss-Matched Records from it.
MissMatchDT = (From row In DT1.AsEnumerable
Where(Not row(“PDF Data”).ToString.Trim.Equals(row(“Robot Data”).ToString.Trim))
Select row).CopyToDataTable

Hope it helps, However if you’re looking for something else let us know.
Regards,
Rohith