There are differences here: first of all, a curse involves five senses of the human being, the eyes of a person who curses, it sparks of hatred, you can feel the taste of blood, you can hear the screams of the victim and so on, in my view, it´s a dangeour practice because if you do not limit it, you can hit a whole family, if you can fuck a person, fuck that person, not the whole family. You need a good protection for not being hit for that kind of energy.
As for the hexes, it involves one or two senses, it attacks the auric camp and it hits two bodies: astral and spiritual, If you are a good magician, a simple work with candels warden off such energies.
A curse is more complicated, because in the course of generations, it becomes stronger, bringing all kind of bad luck, nightmares, misfortune and so on, It´s not impossible to break it, but you need more knowledge for dissolving that.
What I have said here is the practical part, but if you think necessary to make some corrections, it feels free for making.