I expect there'd be a bit more rolling resistance with the wider tire, maybe, but then -- maybe the wider one wouldn't deflect as much so there'd be less power loss to bend the rubber back and forth. I would feel safe in generalizing -- it won't make much difference.
If you use the same tire front and back -- make sure the thing isn't labeled "Front tire use only", 'cause I've been known to give an entrant a bad time in inspection for using a steer tire as a drive tire. There are those that are labeled with directional requirements -- "This way 'round for front, that way (the other direction) for rear tire". Those are okay for either location, obviously.