How can I share asset resources between two worlds, or are they shared already?

[Architector4]

I have some logic I want to split into its own separate Bevy World, with its own schedule, run conditions, set of entities, etc, but which will use a lot of the same assets as the main one.

But I want to share some resources between them, to not end up instantiating the same things multiple times into memory. For example, Assets<Mesh>, Assets<Image>, and such.

I tried making the second world a subapp, and then using systems to throw these resources between them as needed, but everything panics horribly on change detection systems. I'm now thinking of making the second World itself a resource and then running its schedules in a system of the main World or something, but I feel like I'll just run into the exact same issue again.

From here, I wonder: is there a way to share these asset resources between the two worlds, one way or another? Or are the asset servers like this global and I can simply init them again on the second world without fear?

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Or, alternatively, worst case scenario, I guess I could clone over the asset into the other world as needed lol