The nav system hardware in both cars is pretty much identical. If there are any differences, it is probably due to the navigation system OS. You could update the nav OS in both and they would probably be the same.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input