Good catch. Considering how briefly we saw the Centaur, I'm willing to pretend that they're of the same class.While I don;t think it's the Akiraprise drama all over again, isn't the Shenzhou just the one-off cameo ship USS Centaur from DS9 again?
USS Centaur:
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They're only, like, the most important things ever. They seem to cause more arguments than almost any other element of starship design. People have a chronology of warp nacelle design in their head that is very rigid and it tends to be what people pick up on when 'dating' a ship design. The nod to the TOS nacelle caps on the Phoenix in ST:FC is probably at least partly to blame, it set in stone for some people that nacelles had round caps like that from the dawn of warp drive up until TMP.