This meme needs the faces exposed for the full effect
Those who know, know. Those who don’t, wouldn’t think it’s funny even if they saw the faces.
That was always the joke but some people prefer in-joles (i.e. already knowing they have identical faces) over being inclusive and showing the joke at face value. I can appreciate both, depending on finesse.
This joke doesn’t really have any finesse so my vote is for inclusivity.