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The 3er has a slightly wider and longer wheel track than the 1er, along with its tyres, this would account for the difference you feel.
The direction change would be greater (sharper) in the 1er due to the tighter turning radius when the same amount of turn is applied to the steering wheel. You will propably find the opposite when the road is dry. The 1er will be more responsive than the 3er.
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