Well, considering the name, it looks like IZMIZM wanted it to be very similar to it. And in my opinion, there are quite enough changes to make it distinguished to the original (or originals, if you include Cirno's theme), specifically the main melody.
Cak3Lies Now, what I find interesting is that they decided to name a remix of Magic Trooper and Beloved Tomboyish Daughter "Skittish Trooper." I mean, Cirno is really anything *but* skittish (try bullheaded). "Skittish" would suit Nazrin much better, in my opinion.