They are the exact same seats based on my vehicles 07 E90, 14 E84. I'm guessing the e84 seat is on a spacer of sorts for more height.
The two differences I found were the headrests. The e90 is better and more adjustable and the e90 also offers many adjustments for back support while the e84 does not have this feature (at least not mine). Also the leather is very durable; for an 11 year old car I can barely tell the difference between the two interiors.
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