Sometimes even more. Of course that depends on exact car that is being compared, but as a rule of thumb, an all-electric vehicle would be significantly heavier due to battery weight, and as was pointed out:
> Road damage rises [...] to the fourth power of the axle weight [0].
Salient example is a Tesla model S, which have a curb weight of 2.1 metric tons in standard configuration [1], while comparable gasoline-powered sedan weights in at approximately 1.5 metric tons [2]. That means that applying formula above, "average", electric car causes 3.6 times more road wear than "average" CO2-belching one, just due to being 40% heavier while having same number of axles.
To make matters worse, many countries tax vehicles based on their weight (so to translate a fair share of road repair costs to the vehicle owner). And that makes subsidies (in the form of tax exemptions) to the electric vehicles even more important - otherwise electric cars would not be able to compete at all.
[0] https://en.wikipedia.org/wiki/Gross_axle_weight_rating
[1] http://www.teslamotors.com/support/model-s-specifications
[2] http://www.bmw.com/com/en/newvehicles/3series/sedan/2015/sho...