KMST 1.2.493 - Eunwol (I)

So according to that, if I were to compare Ender, Mecha Purge: Snipe and Gungnir's Decent, I would be wrong, they are all "unique", even though all 3 skills are exactly the same thing, only difference is the mechanics behind them and the animations.

Note that I'm not saying Asura is different from Spirit Transformation just because of a few differences, like how Brain Scrambler is to Snipe. And remember that I'm not just comparing it to Spirit Transformation. Like I said, it was different from any other skill. That's why it's unique.

It should also be noted that most skills work the same way (including those three examples you listed), but none of them work like Asura.