Level streaming OR open level, for levels completely different and not connected to each other?

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Thanks.
But with streaming, can you overlay 2 large worlds on top of each other, for example? Say you have 2 Skyrim size maps that you need to switch between?

Also, in the case of ‘open level’, what if the level you load next is a persistent level with smaller sub-levels, and you’ll only load the first sub-level first, for example, and you continue streaming the others after that? Would that be more efficient?

I will be using a loading screen in the case of ‘open level’, btw.