well, from what i understand they are the same two people. do you know multiple personalities? it seems like that, but because there is an element of 'magic', the multiple personalities not only exist in one body but also form another body. Cmiiw ╮( ̄▽ ̄)╭
The magic ball didn't want his mistress to be that sad and understood her regret. So it made an alternative. It made an alter ego of her to negate her previous curse in exchange for her power i. e. Magic ball.
I don't understand the part of two witches...its only 5 chapter but it feels like I watch a whole movie