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That's my assumption. The cabin of the 350 and 450H should be identical, so I can't believe they would resolve issues on one and leave them on the other. However, I must confess that I briefly heard a slight rattle in the front passenger door today.
Hmm, what a coincidence, I think I heard a slight vibration/rattle in the front passenger door area today also. Seemed to be coming from the inside handle/window control area, but not sure. Let me know if you pin your rattle down. I think I am more sensitive to rattles that most people, a lot of the faint rattles/creaks I hear in my 330i other people can't hear.