I want to load actors into the game instance
No such thing exists - that’s not how the engine works. I wish it did! You never move actors in a physical sense. Actors sit in the memory - the references are the addresses.
imagine you have a house with the address. Like we all do. If you blow up the house, you still have the address - you can go there but the house is gone.
When you reload level, the respawned houses are put in another place of the computer memory and new address needs to be made. The old address is useless - something else may occupy that part of memory. Simplifying a wee bit but that’s how it generally works. Memory allocation is dynamic and thank the gaming gods we do not need to worry about it that much…
We talked about this in the other thread. You cannot save actors. You can save their data. The answer to your questions is still the same: