I guess I don't share your interpretation of "exactly". The screens,
look "similar", I'd agree. C series does have a 5th screen, yes. But my opinion was more overall than specific. So, no, they aren't exactly the same. Especially the overall layout and location of items and systems panels.
The XRS, GX and GX Vision don't have "the same" flight deck as the C series. I could start with the GX yoke and go from there. They share the Pro Line 21 avionics lineage, yes.
Any Global pilot moving to the C series should find both quite compatible no matter which direction he/she moved. GX to CS or CS to GX. Either would be an easy transition.
anytime ...
Willie