Damena Otoko ja Dame Desu ka?

Both dramas feature a body swap between the male and female leads.
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A body swapped story between older woman & a younger man. For who like comedy genre this drama is a must watch drama. Machida Keita toooo adorable in this drama.

This drama is about the sweet, trusting friendship between 2 college girls. Yuko and Setsuko are 2 'trend-obsessed' girls who have no particular purposes in life. They didn't have much in life, except for their wardrobes full of fancy attires and their 'self-proclaimed' beauty. The storyline traces their struggle in life: friendship, love, academics, work, etc.

Sakahira Riku, a first-year high school student, is jokingly pushed on the shoulder by his friend Tasaki while swimming by the pool, and falls into the pool with Mizumura Manami, who is next to him. The next day, when he wakes up, he finds that his body has been swapped with Manami's. Both are confused and try everything to get back to normal, but nothing works. They are forced to desperately exchange information about their families, friends, club activities, etc. in order to play the role of each other.

Unattractive & ugly FL a high school girl transform into a charming & pretty girl when she met ML a popular & handsome boy in her school. She ask him for a help to make her pretty but in one condition she can't fall in love with him. Based on a manga/comic book.

Blessed with good looks, Takano Kyohei, a college student, is always suffering from the unreasonable behavior of customers who want him and the sexual harassment of his store manager. Because of his hot temper, he loses his head on this occasion and is fired from his part-time job.

Then, one day, the glamorous owner, Ms. Nakahara, proposes, "I'll give you free board-and-lodging if you can turn my niece, Sunako, into a lady!" Kyohei and Toyama Yukinojo, Oda Takenaga and Morii Ranmaru, the other guys living together in the same boarding house, are enthusiastic, but the person who appears before the four of them is a spooky girl whose hair covers her face and who loves horror and vampires. And so, their tumultuous communal life begins.

Gonta, a good-looking man living a false life in Tokyo, and Katsuyo, whose grandma is a powerful and energetic woman who lives an honest life in the countryside, suddenly exchange bodies one day.

~~ Adapted from the manga series "Dame na Otoko ja Dame Desu Ka" by Nozomi Omori

Both are about a body swap between a man and a woman with two very different lives (grandmother and grandson vs. emperor and beggar).

Gonta, a good-looking man living a false life in Tokyo, and Katsuyo, whose grandma is a powerful and energetic woman who lives an honest life in the countryside, suddenly exchange bodies one day.

~~ Adapted from the manga series "Dame na Otoko ja Dame Desu Ka" by Nozomi Omori

It tells the story of the soul exchange between a prince who has lost his smile and a saddle-carrying merchant who has lost her memory.

Joseon Crown Prince Yi Gang, who lost his crown princess, gave up his own happiness and only thought about revenge. When Yi Gang's long-planned revenge plan finally took the first step, he met the saddle-carrying merchant Park Dal I who looked exactly like the deceased crown princess, and exchanged bodies for unknown reasons, falling into a series of chaos.

Gonta, a good-looking man living a false life in Tokyo, and Katsuyo, whose grandma is a powerful and energetic woman who lives an honest life in the countryside, suddenly exchange bodies one day. (Source: MyDramaList) ~~ Adapted from the manga series "Dame na Otoko ja Dame Desu Ka" by Nozomi Omori

Both are about a body swap (grandmother and grandson vs. emperor and woman).
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Both have family members accidentally body swapping (grandmother to grandson vs. brother to sister) with the male friend of the ML being the first person to know about it. In both, the body swapping leads to character growth/lessons for the ML.

Features a body swap (this time between a guy and his grandma) and has some shippable BL-esque moments.

Both have the ML and FL who lead very different lives accidentally body swapping due to some natural event (eclipse vs. lightning) and undergoing character growth as a result of the swap.