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Here's some data from the USA 2013 BMW X1 Brochure that suggests there's about a 165 pounds (75 Kg) weight difference between the xDrive28i and xDrive35i models. And using the specified weight balance figures most of that is indeed on the front axle (142 pounds / 64 Kg).
I suspect most of the weight difference is the bigger engine, bigger brakes and larger wheels - BMW specifies 17x7.5" wheels for 28i vs 18x8" wheels for 35i. I know that many x28i models were sold with 18" wheels, but I only have one configuration in the brochure to reference.
Model Weight (lbs) % Front % Rear Weight Front (lbs) Weight Rear (lbs)
x28i 3726 50.6% 49.4% 1885.4 1840.6
x35i 3891 52.1% 47.9% 2027.2 1863.8
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165 141.9 23.1 (additional 35i (lbs)
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