Did BMW make a 4.4 w/o secondary air ?

[B&K-X5]

I'm still in the process of swapping the motor in my '05 X5. We had some life get in the way so it was on hold for a bit. The motor that I bought is out of a '06 X5. My old motor has secondary air tubes cast into the heads just above the exhaust manifolds.the new motor does not have them. The heads are different. I called the salvage yard and they have no explanation for this; but say the motor will work in my X5. The block does have N62B44A stamped in it. Is it possible someone put 4.8 heads on it? Is it because it was in California? Do I need the secondary air here in Wisconsin for cold weather starts? Will the motor run in my X5 but I will always have a check engine light on? Can anyone answer this for me; I really don't want to go through all the work of putting it in and finding out that it won't work. Thanx in advance