I don't think either Dylan or Christy Moore would be interested in this sort of comparison. They both do what they do best and they do it very well.
I think Dylan would have stood out had he been Irish. The thing, which has always struck me about the Irish people I have known, is that they sing anyway. A lot of people dislike Dylan's voice, so they say he is a rotten singer. A good voice is of no more use to a bad singer than a Goneri violin is to a monkey. Dylan made his voice mean something to those, who were listening. That is exactly what Woody Guthrie (no Pavarotti either) had done before him. I believe many Irish people would have given Dylan a hearing and clicked. Woody Guthrie actually rated the young Dylan more as a singer than as a writer.
It is hard to imagine anyone else, who could have appeared at Dylan's time and produced such a stunningly diverse catalogue of songs. He had firm roots in all the musical styles, in which he wrote, be they rock, country, blues, "art songs" or nowadays even swing. He also tackled subjects and songwriting angles which no one before him had dared. Who else can you name before Dylan, who took on the complex psychological profiles like, "Ballad of a Thin Man", "It's all right Ma, I'm Only Bleeding" or even the tragi comic "Mississippi"?
Like Dylan or loathe him, he has created a body of work, which stands alone in diversity and can constantly be revisited and reinterpreted by either the man himself or other artists. I think that makes him a bit special by any yardstick.Most of the Irish guys I know place a very high value on words, be they spoken, written or sung. Dylan got through to most of them all right - and that does not surprise me.