Generally it's your state, then your district for a congressman's nom or 61 or 62 for each of the two senators' noms. So I'd think your original NM61 one would be from the senator, and the NM01 would be from your congressman. However, if you're not in the first congressional district, then I'm not sure. None of our MOCs here do principal noms, so I'm not sure at all how or if that's indicated in the coding.