And why not?
Besides, as far as we know the Kilrathi gave different names to the classes, but that's just how Confed codenamed them.
Just like there are two different capship missiles types, both codenamed "Skipper", while it's obvious that the WC3 and movie Skipper missiles are different. And while the movie Skipper doesn't have a name yet, the WC3 ones are called Vorg'chath.