Fated to Love You (2023)

Both are historical mini dramas in which through some fate of birth (sixth daughter vs. twins) the FL's existence is considered a threat to the kingdom for which she was supposed to be killed at birth, but her parents protected her by either disguising her as a boy or hiding her. The FL somehow ends up married. Both MLs are devoted to the FLs and learn her secret before anyone else.

Both are very similar:
Arranged marriage
Wrong bride
The wrong couple falls in love during the relationship
There are betrayal plots inside the family and the new bride helps the husband

Both dramas have twin sisters with different personalities. One of the sisters is gentle and kind while the other is lively and naughty.

A story that follows two couples who mistakenly find themselves in a marriage they never expected and gradually grow in love and trust over time.
The cheerful and clever Xiao Wan Zi grew up as a street performer with her dad selling their special skill of breaking a big stone on the chest. An unexpected encounter utterly changes Xiao Wan Zi's life. Xiao Wan Zi who neither knew how to read nor write suddenly finds herself becoming a princess. Opposed to marrying the princess, Mei San Shao pushes Xiao Wan Zi away in hopes that she'd willingly retreat. Meanwhile, the king has arranged a marriage for Lu Ying Yao, the daughter of the 9th prince. However, bandit Xiao Bao Ye mistakenly takes her as his wife

During the Tang Dynasty, two women are due to wed on the same day. En route to their new homes, a rain shower forces them both to seek shelter in a temple. Downpouring over, Du Bing Yan and Li Yu Hu quickly set out again. Unbeknownst to the people lifting their carriages, each is delivering the wrong bride to the waiting groom!

Through a series of trials and tribulations, the newly-paired couples grow to love each other. As they say, “it’s fine to get on the wrong bridal carriage so long as you don't marry the wrong person.”

Kang Eun Bo is a woman on a mission. When her twin sister is murdered, she vows to find the killer and bring them to justice.
But during the ultra-conservative Joseon Dynasty era (1392-1910), the only woman with the power to order a manhunt for a murderer is the Queen. So Kang Eun Bo resolves to win the prized royal title so she can one day avenge her sister’s death.

To do so, however, she must first win the heart of Joseon King Lee Kyung. Lee Kyung grew up in a time of great political unrest and is less interested in matters of the heart – and more concerned with bringing peace to the realm.

Kang Eun Bo soon discovers that winning the king’s favor will not be easy; the royal court is also inundated with beautiful young women, many of whom hope to wed the king.

But when the king suddenly realizes that he recognizes Kang Eun Bo from a dream, the two begin to form an unlikely bond.
Will Kang Eun Bo ever find her twin’s killer? And could love bloom between the streetwise Kang Eun Bo and the idealistic king?

Both are historical mini dramas and have the similar concept of a marriage mix-up of some sort with the FLs being the favored and less favorite daughters of the same family. In both, despite the switch or mix-up, the marriage(s) end up being (a) perfect match(s).

Both are about identical twin FLs with very different personalities. Due to an accident, the spirited twin ends up married to the ML in place of her sister.