Thanks for the suggestion Colin. The only 1881H which I have kept in my collection, which has the same reverse type, has the H in an undocumented position, see picture. This does not match the position of the H on the 1882Ma, so attempting to overlay the 1882Ma date over the 1881H date did not seem as though it would have definitively helped using the example I have got in my collection. I.e. clearly from different original dies. Also the two examples of 1881Ha and 1881Hb on page 77 of Gouby similarly have the H in yet different positions to the 1882Ma.
Despite this I think it is still a good idea to do as you have suggested and take pictures of the 2 and 1 on my two coins at same 140 x magnification and see if I can get the top left tip of the 1 to protrude thanks. Will need to report back another day as have family arriving soon and need to hide from grandchildren!