What is the difference between the 3 shoggoth(leg, hero, arc) arcane abilities?

Cosmic rift / Cosmic Hero / Stargods' Wrath - 3 different name but same description

The fact that there is 3 different name must mean there is something different in each AA?

And if so can we know what is that difference?

If its same thing then i guess we can call this a bug in the title/description,

Thank you very much in advance for helping me understand