No, missing the point. On the assumption there is only one N over reverse die, you are looking for wear/developing flaws on this die and then looking at the obverses to see which die is paired with it in either the early or late stage. The state of the two obverse dies is irrelevant as they are different, so an increasingly decrepit obverse die is merely telling you whether two examples are early or later with that die pair, but not which came first.
A single die will have been changed when it became unserviceable, but they would not necesarily be changed as a pair as this is un-necessary expense. It is this point which allows you to sequence die pairing.