As long as you have the same objects with the same instance variables and names, you can copy an entire layer at a time. Then you can re-position the paste.
You can do the same with events, as long as everything is the same across the projects, mainly variable and object/family names. If some things are in a container in one but not the other, you may need to redo that.
Copying actual objects is impossible though, as far as I can tell, so you'd need to re-import or re-copy the frames of animations over.