Creating a Landscape Material Instance - Can you do this backwards

I’m very new to UE5. So new I’m still wet behind the ears. I’ve used Unreal Sensei Castle Starter kit. I’m using the Landscape Material Instance, which houses all the textures etc. All works. I want to reverse engineer the instance and it’s related Material, so I can use my own mega scan textures. Or in other words, use the Material Graph chart from the “working” Landscape Material instance, copy that into a new material instance, then create the material, add in the textures from the material instance side not the material side. I hope that makes sense?