Separate different kind of prefab/enemy ?

Hello ! I am making a game where I have different prefabs, each represent a different kind of enemy. They all have the same script to control theme, however I want a way to differenciate them. So I am making a new component script with a number. I try to get this number in my attack script but my getcomponent

  if (recupgeste == "GAcircle" && recupgestescore > 0.80 || Input.GetKeyDown(KeyCode.Space))
         {
            transform.position = Vector3.MoveTowards(transform.position, closest2, 50 /*100*Time.deltaTime*/);
             //Can't work because all the closest don't have s_FoeType_Circle script       
             // FoeType = closest.GetComponent<s_FoeType_Circle>().FoeType;
 
             FoeCurrentHealth = closest.GetComponent<s_EnnemyControl>().FoeCurrentHealth;
             s_EnnemyControl enemyHealth = closest.GetComponent<s_EnnemyControl>();
                         if (FoeCurrentHealth >0)
                     {
                         enemyHealth.TakeDamage(attackDamage);
                     }
         }