x2 on the above, find someone who has INPA, or DIS/GT1 to run a ride height calibration and make sure to park on level ground, tires at proper pressure, and use a tape measure.

Its always good practice when working on the air suspension to run a calibration afterwards. Now, as to why Arnott supplied you with springs with different color bases, not sure. My Arnotts (full air strut units) were installed January 2012 and were both identical and work amazingly.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards