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As a general rule, wider tires are going to cause more fuel consumption - everything else being equal. The rolling resistance of a tire is mostly controlled by the amount of deflection, the amount of tread rubber, and the type of tread rubber used in making the tire. In your case, the amount of deflection is the same - the overall diameter is the same, the load is the same, and if you use the same pressure, that would result in the same deflection.
However, careful selection of a tire can change this. Just be aware that a tire with good RR generally does that by sacrificing the treadwear / and or traction. (the tread rubber compound part of the equation).
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