It would be an interesting experiment if you would test that. Run the 4.6is one for a week monitoring engine temps (OBD2 or perhaps unlocked cluster) and then swap for the 7 series clutch and fan to see if there are any changes.

I thought the thermostats did more of the fine tuning of the engine temp on these and so was curious if the temps would change or not.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
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