True. The Shenzhou resembles even more the actual Centaur model with all the greebles. For instance the Shenzhou even has the two small winglets on top that the (actual Excelsior-class) saucer of the Centaur has.
The Centaur is missing the deflector, the double pylons, these bridging elements between the pylons, the bump in the middle of the saucer-top, the two bumps on the to the side of that. The whole backside looks different. Apart from that they are basically the same. Like a Ferrari 458 is basically the same as a Ford Model A.