When I first got my Lamotte nitrate kit, 1 and 2 were the same. Either that or they were reversed. I can't really remember. I know because I compared my comparitor to a friend's.
Anyway, Lamotte sent me a new one without any problem, but I suppose it's always possible that it has happened to others from time to time. 1 and 2 look different enough on the the one I have now.