change button texture from different button press

What I want to do is have a set of buttons that determine what textures could be used, when a user presses this button it will trigger which texture will be used. Then the user can press a different button and it will change the texture of that button to the texture that was select previously from the group of texture buttons.

How do I get it to where the second button will have its texture changed when it is pressed?
Please help, below I have my code for both scripts I am using… Thanks again!

    static var materials    : Material[];
       
        static var textureButton : Texture;
        var brickTexture : Texture;
        var stoneTexture : Texture;
        var glassTexture : Texture;
        var DryWallTexture : Texture;
    
        private var isGlass            : boolean = false;
        private var isStone            : boolean = false;
        private var isBrick            : boolean = false;
        private var isDryWall          : boolean = false;
    
    //Dimensions for the different windows in the UI
        
    private var drawingWindow :Rect = Rect(Screen.width/2 - 800,Screen.height/2-400,1000,680);  
    private var materialsWindow :Rect = Rect(Screen.width/2 + 200,Screen.height/2-400,400,340);
        
    //Dimensions for the Materials UI
        
     private var glassOptionButton             : Rect = Rect(10,20, 50,50);
     private var stoneOptionButton             : Rect = Rect(65,20, 50,50);
    private var brickOptionButton             : Rect = Rect(10,72, 50,50);
    private var paintedDrywallOptionButton    : Rect = Rect(65,72, 50,50);
    private var copperOptionButton            : Rect = Rect(10,125,50,50);
        
    function OnGUI()
    {
        GUI.Window(1,materialsWindow, materialsWindowFunc, "Material Window");
    }
    
    
    function materialsWindowFunc(windowID: int)
    {
       if(GUI.Button(glassOptionButton, "GL"))
        {
            isGlass = true;
           
            if(isGlass == true)
            {
            isStone = false;
            isBrick = false;
            isDryWall = false;
            //textureButton = materials[2];
           textureButton = glassTexture;
            }
            Debug.Log(textureButton + " This Will be glass");
        }
        if(GUI.Button(stoneOptionButton, "STO"))
        {
            isStone = true;
           
            if(isStone == true)
            {
            isGlass = false;
            isBrick = false;
            isDryWall = false;
            //textureButton = materials[5];
            textureButton = stoneTexture;
           
            }
            Debug.Log(textureButton + "This will be stone");
        }
        if(GUI.Button(brickOptionButton, "BR"))
        {
            isBrick    = true;
       
            if(isBrick == true)
            {
            isGlass = false;
            isStone = false;
            isDryWall = false;
            //textureButton = materials[0];
            textureButton = brickTexture;
           
            }
            Debug.Log(textureButton + "This will be Brick");
        }
        if(GUI.Button(paintedDrywallOptionButton, "PDW"))
        {
            isDryWall = true;
    
            if(isDryWall == true)
            {
            isGlass = false;
            isStone = false;
            isBrick = false;
            //textureButton = materials[3];
           textureButton = DryWallTexture;
            }
            Debug.Log(textureButton + "This will be Drywall");
        }
     
}

Script 2

import changeMaterials;

private var changeButton            : Rect = Rect(10,125,50,50);

function OnGUI()
{
    
    
    if(GUI.Button(changeButton, textureButton))
        {
        
        Debug.Log(textureButton);

        }
   
}

Have two variables

Textrue selectedTexture;

bool aTextureSelected = false;

in your first set of buttons, when selected assign

selectedTexture = DryWallTexture;// repeat inside all buttons appropriately

aTextureSelected = true;

then in your script 2

function OnGUI()

{

if( aTextureSelected )
{
    textureButton = selectedTexture;
    aTextureSelected = false;
}

if(GUI.Button(changeButton, textureButton))
    {

    Debug.Log(textureButton);

    }

}