I have seen many minor differences over the years. In fact, when I first starting training in the 60's, I remember that the opening moves of H2 were taught differently by different instructors in my dojo. Some taught the second and fifth moves as a trap/break, and others as a block and a punch. (I can't remember which of the three instructors, Okazaki, Enoeda, and Kisaka, did which however.) I think that was a good early demonstration that minor differences in kata are irrelevant, a point that was driven home as I started seeing subsequent diktats about changes in kata performance.