Destroying clones?

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class OnCollision1 : MonoBehaviour { public Transform other; public GUIStyle style; public GameObject crate2; public GameObject GameObject3;

 void OnGUI()
 {
     if (other)
     {
         float dist = Vector3.Distance(other.position, transform.position);
         if(dist < 20 )
         {
             if (GUI.Button (new Rect (600, 100, 100, 100), "NO")) {
                 Destroy(crate2);
                 Destroy(GameObject3);
             }
             GUI.Button(new Rect(800, 100, 100, 100),"YES");
             GUI.TextArea(new Rect (600, 250, 300, 100), "Do You Want To Open This Crate?", style);

         }

     }
 }

}

I have this code to destroy a crate when it collides with the player. I copy the same code to the clone which spawns in during the game. Since I can not define "crate2" as the clone of the original crate, it doesn't destroy the clone of the crate. How can I fix this? Thanks.