I don't know for certain but would think not as you have a piece of machinery involved now which has to locate in the top and bottom of the fly-press. You see quite a lot of underlying detail on some hammered coins, but rarely see anything which could be rationalised to a previous die on the milled. Recut or overstruck corrrections to letters are common, but they usually involve the preceding or following letter in the legend, suggesting a misprunt.