Hi there,
I made some photos of my opened N950 some time ago. But I haven't taken it apart all the way down to the pcb. So I can't tell which connector is used.
But I know that the N9 has a completely different pcb layout. I don't think that it has connectors for a keyboard... Sorry.

But here are the photos anyways:
https://twitter.com/#!/zehjotkah/med...com%2F3odUZj0v
https://twitter.com/#!/zehjotkah/med...com%2FKj4VYTEx
https://twitter.com/#!/zehjotkah/med...com%2FgmWNQza6
https://twitter.com/#!/zehjotkah/med...com%2FjImNvqly
https://twitter.com/#!/zehjotkah/med...com%2FQfFD3sVC

edit: just read the thread a little bit. yes, there a far, far more N9s than N900s.
edit2: but I will completely tear apart the N950 as soon as I'll get the successor.