It is not absolutely necessary to go with the same brand. There may be other choices available with the same rating that are less expensive and wear longer. The tires should be the same height as the current tires but other than that and it will be noticeable if someone looks closely it will be fine.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas