Responses
Have you read this one?
https://www.mangago.me/read-manga/actually_i_was_the_real_one/
It’s not exactly fake vs real but it sorta has the same vibe
https://www.mangago.me/read-manga/suddenly_became_a_princess_one_day/
*real vs fake daughter trope* tried looking for it but alas no tags for it here or on baka.. trying my chances. plsthxurelectricbye ＾▽＾