The only real difference is that charges can be positive or negative. The greater the distance between them the smaller the force. Both laws look just the same.
Newtons 3rd Law of motion is not the law of gravitation.
Columbs Law is the law that quantitatively explains the electrostatic force between two objects. Before answering your question Ill tell you what assumptions I have made for I found some ambiguity in your question. Thus gravitational forces are always attractive. Using Coulombs law it is possible to calculate the magnitude of the electromagnetic force.