I think you said before that a person could dye their hair, so don't sweat it. The only thing the two adult women have in common is brunette hair, dark eyes and a slightly fuller build. I don't see that their faces are especially similar so please don't sweat it on my account. The images don't have to be exact and we can morph them in our minds to be as different as is needed. I think the main thing that comes across from a face is personality, so get that right and the rest will follow along.