Two different material not only in color but also in texturing. Each Base color have 3 Different texture that assigned on wood. you can adjust displacement value through the way you want to play with height but i recommend create High polygon Shape and put displacement value on 3 to have better result. 2k pbr material this file contain: 2016 3ds max obj fbx material library and also you have textures: Base Color Ambient occlusion Normal Height Roughness