Replacing Old Material textures with Old Terrain Textures

I am not a texture guy, I need for my game a the old sandstone and sand textures as materials.
I’ve looking for someone who already did it but everyone only made the Materials not the terrain.
I tried doing it myself but i have no clue at what im looking at since I never ever made a PBS textures in my life.

Disable MaterialService.Use2022Materials to get the old materials.