Overlapping UVs for characters


I would like to know if it is appropriate to have copy/pasted elements in the 3D program of the character/interactive meshes. For example, if my character has 20 teeth, can I copy/paste them (their UVs will be stacked in the same spot)? Or do I have to make a separate UV channel for lightmap like with static meshes?

I am talking about elements that aren’t static and don’t have any baked lightning information in UE4.

If your object is not being statically lit with lightmaps, then your UVs can be setup however you want. Nothing wrong with sharing UVs across different elements.