When I wrote a post comparing my Blue Cords, I noted that Audrey (my one 1968) looks delicate/dainty compared to the others (all from 1969). I feel the same way about Fiona when I look at her compared to my other Dungarees. She definitely stands out in all the groupings I tried, not just due to her wispy bangs, but also her eyes.
Here she is between my other "dark" Dungarees: Hayley (left) and Harlow (right).
Here she is between my Dungarees that have narrower faces: Hayley (left) and Hester (right).
Compared to my Redhead Quartet, I think Fiona looks most like Hayley. They might pass for cousins or even sisters, but certainly not identical twins.