How can I change sprites in animation clip?

My project has 2 folders in the Sprites folder: "NRM_Palette" and "GB_Palette"

--EDIT: The current default directory is GB_Palette--

NRM is a copy of the GB Folder but the colours are changed in each of its files. They are otherwise named and sliced the same.

I'm trying to make a mode where the colour scheme of my game changes based on a bool in the Player script: "nrmPalette". Is there a way to have my animation clips (and standalone gameObjects) grab and change their sprites from a specific directory?

I attached this script to each object I want to change, it's based on a video from Unity from 2014, but it's not functioning:

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

public class PaletteSwap : MonoBehaviour {

 public string spriteSheetName;

 private void LateUpdate()
 {
     var subSprites = Resources.LoadAll<Sprite>("NRM_PALETTE/" + spriteSheetName); 
     
     if (!Player.nrmPallet)
     {
         subSprites = Resources.LoadAll<Sprite>("GB_PALETTE/" + spriteSheetName);
     }
     
     foreach (var renderer in GetComponentsInChildren<SpriteRenderer>())
     {
         string spriteName = renderer.sprite.name;
         var newSprite = Array.Find(subSprites, item => item.name == spriteName);

         if (newSprite)
             renderer.sprite = newSprite;
     }
 }

}