Save instances and recognize them on load

I'm trying to find a way to save GameObjects in the scene and then Load them on runtime with their data, but I can't find a way to identify each GameObject, load their data and if they are instances instantiate them again and load their respective data.

Either GetInstance() and GetHashCode() return a different ID when i build the project or if I instantiate them in a different order so I can't identify them.

What I want is to save certain objects in the scene and certain instances objects in the scene, so when i load again they are back there with their data.

Any ideas? Thanks a bunch!