swapping a 97 2.2l with a 99 2.2l

I have a 97 impreza with a bad engine that I would like to swap out with a 99 2.2 low milage engine and trans from a wrecked impreza that I also have. I know the 97 has EGR. Can anyone help describe what all would need to be swapped. Maybe it is not even worth it.

Thanks

Kurt