I would highly doubt it!!!
A pro boxer will hit harder than you could imagine, even at that weight! Usually at that weight, they are pretty fast too, and know HOW to hit.
Most idiots on the street would like to think they can box, and when they get the chance, they throw stupid swings at people, thinking they will KO them in one blow...
I have a mate that fits that description, and he would have no hope whatsoever against a lightish boxer, and he's 15 stone! WAY too slow and thinks his punch is heavy, which is the norm among guys that want to fight in the street!