What's in a Name?

As I mentioned in a previous post, one of my successes this year has been this large purple beefsteak tomato, the seeds were given to me by Mas du Diable in the Spring. They were labelled 'Noir du Crimee' I am assuming that over the years that names vary and change.. I assume then that they are the same variety as Black Russian and Black Krim ? (The Crimea being a part of Russia)?