Basically he's re-edited Ian McDiarmid's 2004 dialogue to conform to the original 1980 while using ROTJ for the hologram. The only difference was instead of saying Luke Skywalker he says young Skywalker and that's because Ian never says Luke. That might be changing though if Ady can get the audio Jaitea found to sound right.
(Oh and I think Palps mouth might still be from '04)