[Fyron]

You can load an empire file in another mod so long as the mods have exactly the same number of racial traits, and you haven't spent too many points given the costs in the mod. If any traits in those slots have completely different functions, you will get a weird set of traits, but it will be predictable based on the file ordering. If you try to load a stock empire file in P&N, Proportions, etc., which have different amounts of traits, you will get an error message.