From the pics the running boards seem about the same. What could make difference is the driver's seat position relative to the door's sill. I've compared my E70 to my brother's E53, both have running boards, but getting out of his X is much easier. It came out that E70 has front seats by approx extra 1.5-2" further away from the door (sort of deeper inside), and that made the difference of in/out experience.

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive