What heads fit DC's K-body-11?

Can anyone tell me what heads fit Doll Chateau's K-body-11 (both measurement-wise and whether or not the face looks in proportion)? I really like Kid Sky's 27cm Tutu head, and the measurements for the head are only .5cm bigger than the measurements of the body. My main concern is that the actual face for a 27cm doll would look too juvenile for a 50cm doll. At the same time, though, the K-body-11 is still supposed to be a kid. So any recommendations?