I also know that Integrity's Avant Guard older 16" heads fit on those bodies. I never tried them vise versa.
Other bodies which fit are the 16" Madame Alexander ones.
I have tried all these and know that they fit.
Ellowyne's head on a Deedee Athletic body:
Parnilla on a DeeDee athletic body:
And if all else fails, you can buy a cheaper
non-articulated Tonner doll with a head that you don't care for and
put the head you want on the body.
Here is Bella's head on an older non-articulated wrists body.
If I find more pictures, I will post them.