Change Texture of Clone

Hello Everyone

i'm trying to do advanced BulletHole

i use this code [Attached To The Bullethole Prefab] to change Texture :

     public string MyType;
     public Texture[] Wood;
     public Texture CurrentTexture;
         
     public void UpdateMyTexture() {
     int random;    
     if(MyType == "Wood"){
     random = Random.Range(0, Wood.Length - 0);
     CurrentTexture = Wood[random];
     }
     
         transform.Rotate(new Vector3(0,0,Random.Range(-180.0f,180.0f)));    
         transform.renderer.material.mainTexture = CurrentTexture;        
     
     }
 

and in Shoot System [ Attached To The Player ];

     GameObject go;
             
                 float delta = -0.02f;
                 Vector3 hitUpDir  = hit.normal;
                 Vector3 hitPoint = hit.point + hit.normal * delta;
                     
                 switch(hit.collider.tag)
                         {
                 case "Wood":
                     BulletManager.MyType = "Wood";
                     go = GameObject.Instantiate(BulletHole, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;
                     break;
 
 

the problem i get is : when i shoot and set a new texture for the bullet its change all old BulletHoles not only the new one