How to make copy of InstancedFoliageActor on same Level?

Hello,

I draw Foliage on the Landscape (a huge amount of trees, rocks and other stuff).
Next I want to make a copy of InstancedFoliageActor and edit this copy, but there no such actor in the actors list.

Actually, I want to make a thing. When player triggers the event, the first Foliage would be replaced with the second, but player should not notice this as only 20% of the map (~500 objects) would changed.

So - is it possible to make a copy of this actor and next make the first one invisible and second visible when it would be triggered?

Thank you.

Well, I made a workaround with two streamed levels: