Comparing subtle differences in how refinements can help your skiing. This is high level skiing, intermediate skiers may think this is nit-picking , however all of this applies even at the learning levels. And remember we never stop learning, wherever your level is now.
The most obvious difference to me is the outside arm, which effects the counter-acting, counter-balance slightly, and the angular momentum of the body. In the end, I think it affects the amount of adjustment you have to make at transition. If some don't see it, look at where the bottom of the ski pole is (the pointed end) in the different frames on the outside arm.