If they're Avant lights then I believe it is a direct swap between pre-facelift and facelift tail lights. Saloons will require a new boot and bumper if you buy facelift lights for a pre-facelift vehicle.
However, going from Halogen to LED's will require coding changes at the very least, as well as new plugs and wiring as the functions of LED lights are different to Halogens, i.e. brake lights will be across both units instead of just 1 as with halogen, etc.