Which loop is best to find specific game objects in an array?

I’m recreating an old crash bash pogo game; I have 64 tiles in an array and they each have different materials attached to them allowing them to change to a players colour when collided with but now I’ve got a points banking box that needs to loop through all 64 tiles to find which tiles have a specific colour material attached so it can allocate the points to that player or enemy.
I’ve been trying a foreach loop to find and name each tile with a players material colour but using that one is causing all 64 tiles to turn that players colour rather than just name the ones that are currently the players colour. Should I be using a different loop or introduce a break clause somehow? Any help is appreciated.

Here is my code so far…

public class Points_Banker : MonoBehaviour
{
    public Material TileOriginal;
    public Material Player1Mat;
    public Material Enemy1Mat;
    public GameObject[] tiles;
    
    public GameObject player = null;
    public GameObject enemy1 = null;

    private void OnTriggerEnter(Collider other)
    {
        if (other.name == "Player 1")
        {
            AddToPlayerScore();
        }

        else if (other.name == "Enemy 1")
        {
            AddToEnemy1Score();
        }
    }

    public void AddToPlayerScore()
    {
        player.GetComponent<PlayerMoveTest>().itemCollection.Play();
        foreach (var item in tiles)
        {
            if (item.GetComponent<Renderer>().material = Player1Mat)
            {
                Debug.Log(item.name);
                player.GetComponent<PlayerMoveTest>().score += 1;
                Destroy(gameObject);
            }
        }
    }
    public void AddToEnemy1Score()
    {
        enemy1.GetComponent<EnemyTest>().itemCollection.Play();
        foreach (var item in tiles)
        {
            if (item.GetComponent<Renderer>().material = Enemy1Mat)
            {
                Debug.Log(item.name);
                enemy1.GetComponent<EnemyTest>().score += 1;
                Destroy(gameObject);
            }
        }
    }
}