Yes, this is another way to cleverly modify a style. But often in a second chorus, it's not just drum fills, it's the way various instruments are played. For example, in Chorus one, a piano part might be laying out mostly, hitting the occasional chord, where in the Second Chorus, the arrangement is much fuller. Or, another example, you'll often see an instrument that lays out entirely in CHorus one, but which comes to life in Chorus two. I don't think part markers would make a difference with something like this.