Is it that selected floor and flat floor with stones around it?
Can you show both materials?
Also tip for doing tileable/modular assets: make master material that has parameters for texture2d, metallic, roughness etc. Then for your assets make instances materials out of that master, and set textures as that instanced material parameters.
For your asset it is either different materials setup, or mesh has different smooth groups/ normals. You wrote it is same in unlit but different in lit mode, so i bet something messed up with normals. Also texture tiling may be different for both assets, so more dense normal map texture results in different lighting on it.