Yeah I saw that third picture and my first thoughts were WTF!
Money savings of the CM9 vs the PM9?
Shouldn't be the case, at least I hope not. The only difference in these two are the slide, barrel, and slide stop from what I know. I'd imagine they use the same frame.
Out of curiosity, what part of the 3rd photo made you think, 'WTF'? Is it where the frame's slide rails begin?