I wouldn't normally complain about too much of a good thing, but don't the faces and boobs look a tiny bit similar?

Somewhat, yes, but it's not really anything to get upset over. Manga artists tend to put similar features on faces and bodies in general. There are small differences.
I will say that Fukudahda (Kensoh Ogawa) tends a bit more toward the similar-features side than usual, though.

Hey, at least the underwear is inventive...