Answer:
The difference is that the head of the medusa could be cut off its body, while the head of the gorgons could not.
Explanation:
Gorgons was the name given to the group of sisters formed by Esteno, Euríale and Medusa. They were cursed by the goddess Athena to transform into monstrous, horrendous creatures, with hair turned into snakes and the look that petrified anyone who came in front of them. The sisters lost their beauty and became monsters just as Athena wanted. However, Medusa remained beautiful and had an affair with Poseidon. This was an act of boldness for Athena who cursed her again, this time, leaving her mortal, unlike the other sisters. In this way Medusa's head could be cut, as it was, but the heads of her sisters could never be cut.
