Daiichi hook charts says they are "similar". I read that to be that they look alike but may not be the same "size".
When you say "size" and hooks in the same sentence your in for trouble.
Everyones 16 is different. There is no standard that I know of and probably never will be one. I mean if there was, then all the hooks would be the same and there would be no need for mutiple manufactures