It really depends on the OUTPUT ma of the charger, not the rated ooutput of where it is plugged in. However if the charger output is more than the rated output of the outlet you plug it into then there would be a difference. ie....if your computer is rated 500ma, charger is 750 output, and wall adapter is 1a (1000ma) then the wall charger will be faster. if the output of the charger is 450ma then there will be no difference since both power sources are above the rated output of the charger.
You DO NOT want to use a charger on any power source that is rated for less ma than the output of the charger. Your power source may be damaged.