We could do that. Now, the fake-OP's question is specifically about the Plane of Shadows as seen in D&D cosmology, and that question seems to have a fairly clear answer: the Plane of Shadows is stated to be constantly shifting, gradually changing shape, which makes creating an exact map impossible. That implies to me that the Plane of Shadows is mirroring the Material Plane, not the other way around, since the Material Plane is the "solid" one. Ergo, if you were to burn down a forest in the Plane of Shadow, it would probably reform to remain consistent with its material counterpart.

As for general, I prefer to take a nihilistic approach to world-building and not objectively confirm the existence of souls (as a separate thing from the body), the afterlife, or any such thing. If alternate planes are involved, they probably overlap with the known plane in the sense that opening a portal in plane A will consistently bring you to the equivalent location in plane B, but they don't generally mirror one another. As such, I've never faced the fake-OP's issue.