Yes, that's what people like Louis Rossmann famously do. Apple, in turn, tries to serialise each chip and make it only boot if all the serial numbers match.
You don't need a schematic to do that.
Aftermarket board and passive components; transplant the Apple chips from a damaged board. Then you don't need to cannibalise the board, you use a new one.
I assume most physical damage and corrosion etc affects the board and passive components.