go check the Xenon's again. I garauntee you they are different now. You can't get a 328 Xenon bulb. When you go to get one replaced, they are supposed to replace them with 2 current gen. ones. Either your CD is wrong, or they just list 1 part number for the correct assembly.
Stack a 328 next to a 330i. Even you should be able to see the difference.