Yes, they are different. They are better then the D15B8 (CX) or D15Z1 (VX) manifolds, but I would still recommend that you get a Z6 manifold for it. Complete Z6 manifolds (manifold, fuel rail, injectors, TB, sensors) only go for around $75.

If you are desperate, the B7 manifold will probably bolt up to and work with the Z6 head, but it is less then ideal.