ZBrushCentral

Keyshot for ZBrush, does it work with ZbrushCore?

I was checking out the Keyshot for ZBrush Render, and noticed how they made a point of saying the only Keyshot you can use with ZBrush is the one for zBrush.
I am wondering if anybody could tell me, does it work with ZBrushCore.
And is it worth the money? or better yet, how much better is it then say substance?