You will be able (have to) use the green output as the only input on the head unit. It should still give stereo and the built-in fader will (should) still work as nothing in that department has changed.
Just make sure you get a stereo patch cable rather than a mono one (there will be two insulator bands on a stereo jack).
Just make sure you get a stereo patch cable rather than a mono one (there will be two insulator bands on a stereo jack).