I disagree, deepfaking completely replaces the face. It doesn't ahve to be close to start with. Check this one out: https://www.youtube.com/watch?v=861gfPVmgdc
In movies you don't usually have the luxury of choosing the original face you want to replace, but for people who make memes (or porn), you commonly choose a source video featuring someone that resembles the person you want to put in.
Hiring an actor that roughly resembles the person you're trying to deep fake seems doable.