Uv Pass π π―
A UV Pass only maps the image. It doesn't know where the lights or shadows are. You will need to use blending modes (like Multiply or Overlay) to marry the new texture to the lighting of the original 3D render.
When imported into compositing software (e.g., Nuke, After Effects, Fusion), the UV pass acts as a map. The software uses a node (commonly called an or UVMap node) to read the pass: uv pass
UV Pass Band β Defining Spectral Transmission in Optical Systems A UV Pass only maps the image
UV Pass β Unlocking Texture-Driven Masking & Effects uv pass