Yes, the model isnt fully uv unwrapped. but I’m just talking about the wooden planks at the bottom. They have a UV set for the textures and a set for the Lightmaps. I tryed it with overlapping uvs and non-overlapping UVs (for the texture). The lightmap uvs arent overlapping of course.
i also tried this method: [Blender] Same model but different shading quality? - Asset Creation - Unreal Engine Forums