Have a look at a free pack of 4K Materials for Wood Flooring in Unreal.
Please note that the pack also includes a demo scene.
“This pack contains 25 wood flooring materials with crispy 4K textures which will elevate your game and ArchViz projects to the next level,” states the description. “The benefit of Karl Detroit’s Wood Flooring lays in the flexibility of its Materials. Thanks to the predefined material parameters, you can change the color, roughness, normal and ambient occlusion values, depending on your needs.”
Get the pack from here. You can also find the second volume here.