Hello Richard, yes there likely is a difference between Morris style Anglo playing and Irish since the single note "cross-row" playing more seldom is expected to employ the distant buttons in the range of the 4th finger. One detail I wonder about is that if not having fairly long fingers the high notes on 3rd row in particular are not reachable for the little finger unless you rotate the instrument vs the hand clock-wise looking at the right side. Many Anglo players keep the instrument in that position all the time and the reason likely is just that - to reach the 3rd row better...OR what is it otherwise?