One on the right looks very pre-recorded, which is funny because I also thought the one on the left was pre-recorded when I first saw it.

For one you can tell the difference in lighting by color of his face and can replicate it across many press conferences over the years. Some networks have the bloody orange filter over his face which makes his hair a bit darker, others tone it down more and you can see him have light yellow-ish hair and a paler face in those.

Hair on the left does look very white/grey... could they both be pre-recorded? One was just recorded way before the other one? Also possibility of deep-fakes, like earlier posts have mentioned.