Both feature:
- young female leads who are trying to survive against enemies who are trying to kill them
-dark killer themes
-kick ass female action
-strong female empowerment
The stories are completely different, but the message/theme is somewhat similar
There is not much to say why they are similar, more where they are different.
It feels like Revenge Girl is a Chinese remake with a sprinkle of dystopian future on top, and more wuxia style of fights with less dead bodies than in 'The Witch'
Similar vibe, plot line, even character relationships. Both deal with inhumanly strong female main characters (gene manipulated) on a journey of discovering the past/truth.