2 cavegirls.
2 cowgirls, 2 female sherriffs, 2 female outlaws, or other Wild West variations.
2 medieval queens or princesses or female knights.
2 futuristic female Cyborgs (Tricia Helfer vs Jeri Ryan).
Female military counterespionage interrogator vs captured female spy, in a more liberated, integrated military future.
Female vampire vs female vampire slayer.
(But none of these are new ideas. Yours are more creative.)