Well if you are talking 6263/6265 pushers, I have to admit I have been wondering the same for quite some time. I have never seen or handled genuine 24-p302-0 pushers in person, because they are just so damn expensive. I have a source who was able to order them from Rolex for 200€ a piece which imo is really, really expensive (that's two new 703 crowns from the same source). I might order a pair at some point, maybe when I get the V726 serviced the next time, but right now I don't see the point.
Here's a picture of a Rolex serviced 6265 with service pushers. I have examined my cousins pushers thoroughly comparing them to this picture over and over again but couldn't really tell. I think the curved part on the outside of the pusher maybe a little bit more pronounced on the genuine ones. Also the "teeth" might be a little bit finer, but honestly I don't know. It may be something which is only noticable when you handel both watches in person, maybe LHOOQ can chime in here, I think he has handled genuine vintage Cosmographs on a few occassions...