df <- data.frame  (
    "RowId" = 4:7,
    "x"=c("1_1", "2_2", "3_3", "3_3"),
     "y"=c("1_1", "3_3", "2_2", "3_3")
                         )

How can we compare corresponding values of x and y (first value of x exacly matches with the first value of y)?
If they were not matced exactly how can we get the row id?
In this case the row ids were 5 and 6.


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