Sally is Nagisa (Cure Black) because I feel like there tomboyish personalities match despite some differences.
Nicole is Honoka (Cure white) the more graceful one and thinking of Nicole with this fighting style would be kinda cute. There friendship just adorable and is so alike.
In stead of the black and pink / White and Blu, I used there original color pallets to match. These two are perfect considering Futari Wa was the very first season of the entire pretty cure franchise. In conclusion, they are the veterans of there own franchise.