Just by the posters you can tell it's the same kind of story: multiple layers of betrayal between married and single people with at least one old flame involved.
Both have a boy for hire theme. Boy for Rent is the lighthearted drama. Game Rak Ao Keun is darker with intense passion and betrayal.
Both have super power themes in high school, but Mob Psycho has the leads as students. Both of these have odd, offbeat visual styles and involve characters that can see hidden things, plus weird humor.
The themes are different, but both of these shows are the same quality level, and that's not a compliment, lol. Both have a late-night trashy vibe with a story that requires you to check your intelligence at the door. The MLs in both are hair-pullingly frustrating.
If you want the more watchable version of this theme (woman hired to have a child by a rich family), the try Leh Ratree. So Sanaeha has the same theme but is a more frustrating watch. The two FLs are also night and day (sarcastic and bitter vs innocent in Leh Ratree). But the MLs kinda act the same toward the FL, in the beginning at least. The MLs even have a similar look.
Very similar themes about a son running away from home and returning years later transformed and ready to claim property. Both have childhood friends as FL they are reunited with, and both MLs are misunderstood in their intentions (and both kinda scruffy-looking when they get back).
If you like a rural farm setting paired with a hyper-possessive male obsessed with the FL, both of these will fit. Raeng Tawan has a revenge plot directed at the FL, while in Pin Anong it's directed at others.
Both involve the business and dangers of birds' nest harvesting, and extended time on remote islands. But Mungkorn Suer has directly warring families, is set in the past, and has a faster-moving romance with stronger chemistry. Sampatan Hua Jai shows more detail of the nest-harvesting process, while Suer is more about competitors in the market.
Both involve warring families in the business world with high stakes. If you want to see a well-matched pair and a badass businesswoman, Ra Raerng Fai is good. The actors are also more mature/seasoned so the acting is excellent. So Wayree has younger stars and a very controversial start to the story.
I'm surprised Hirugao hasn't been recommended yet. Both involve 2 women that are friends at the center of affairs, with one woman judging the other woman until she finds herself in the same situation. Both weigh the impact on family and adolescent children. The romantic MLs in both are quiet dreamer types.
Both involve ghost-seeing leads assigned to work with the underworld to maintain order. Ferryman has 3 seasons + a movie.
Both have a 30+ woman and a bossy ML. Both MLs are running their own restaurant and cooking behind the counter. The ML gives dating advice and scolds the FL on her choices, while also sometimes stepping in to help. Both have couples that date others before considering each other.