Assuming I have 2+ dedicated servers running and they are all using the same level.
Is it possible to connect my client with multiple of these dedicated servers and receive network updates (e.g. for replicated actors) from each of them at the same time?
No, input can only be focused on a single Application at any given time. You’d have to tab back and forth between the instances.
You can boot two instances of a game and connect to each instance, but they will not be connected in any way.