Yeah, I don’t know… The idea is awesome, but putting the flashback scene side by side with AOTC scenes still don’t seems to fit to me. Even with the deepfake on Hayden, he still looks very different from when he was younger (he was skinny in AOTC, and now he has a thick neck, for example). Even Mcgregor looks so much different too, the voice, the wig/hair…
Maybe if you manage to make their skin tones be more or less the same from when they were younger, and the tone of voice too, the difference could be less noticiable. If you notice, they looked a little tanned back then. At least, that’s the impression I get.