The face radical and the face kanji are the same! But this isn't just a face like the one you're looking at your computer/phone with. It's the surface kind of face too!
This face you're looking at, that has a lot of surface area, belongs to men (めん). Not a single man, but all men put together. It's hundreds of thousands of men's faces in a row.
Currently there are no similar looking kanji which exist in the WaniKani learning system