is there a way to run this on a 64 bit raspberry pi 4 B?
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at the level at which this game runs at, the architecture of the processor running it does not matter.
you can already think of userland as being a virtual machine, so long as your not pulling any low level trickery in the software which is unlikely considering their using a game engine.
they have a pretty large amount of layers between them and the host processor so it should run as long as you have those layers in place.
No, the architecture does matter. All Unity programs (and all compiled programs for that matter) are compiled to machine code, and each CPU family has a different machine code instruction set. PCs and most macs up to this point have x86 family processors which are all compatible with each other but a raspi has an Arm CPU (like the one in most phones or tablets). It’s true that the system calls for all Linux systems regardless of arch remain the same, but the actual instructions that are used to do computation and handle memory are very different.