Actually, the way I see it, the Century shares more similarities with the Sovereign than this.
1. Both Sovereign and Century have elliptical saucers, Odyssey's is more like DJ's Eclipse in shape.
2. Century and Sovereign have angled up and straight (viewed from fore or aft) pylons, while Odyssey's curve up.
3. Century's shuttle bay doors closely match Sovereign's impulse engines in size, position, and shape.
4. Both the Sovereign and Century have no neck, whereas the Odyssey has two.
5. Century's secondary hull is roughly the same shape as Sovereign's, but a bit broader, while Odyssey has, as mentioned before, curves reminiscent of the Luna.