When it came to skin tone and complexions with various differences, they were things that could be covered up so that she would appear the same as what was displayed on the photo identification.
The photo might have been taken after applying makeup, so there could be skin blemishes like freckles, scars, inflammation and much more that could have been hidden underneath.
If Ash could apply makeup that matched the right skin tone, then it would make her match the photo even more, especially since it would help her to cover up the small scar that was just under her eye, at around her cheekbone.
Any other more obvious differences could often be explained by changes that could happen after the photo was taken, like maturing further, gaining an injury or something that could cause a person to gain or lose weight and muscle mass.
Even if Ash was able to find a doppelgänger matching her appearance, there would always be small or large differences between her and them.
