Where did you get the part number for your new springs? Usually same basic vehicles with sport suspension has 3 separate spring variants depending on other additional equipment altering the weight = axle load. So considering the one digit difference in part numbers likely your new springs are calculated as a different variant and axle load. Though those changes are minor and on E53 heights can usually be neglected. Spring part numbers are on a separate spring table on official TIS and only few have access to it.

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey