Similarities:
- In both, the daughter of a rich family gets amnesia and gets brought up by poor family
- Replaced by the original daughter of the poor family
- The daughter falls in love with childhood child that she can't remember

Differences:
- Because of You is fewer episodes
- Because of You has a better OSTs

If you had a choice, choose Because of You

Both have a possessive male lead who won't stop until he has the female lead and is very protective of the female lead