Both are light historical dramas in which the FL works for an escort agency. Both MLs are very devoted to the FL and are at one point poisoned and later cured after almost dying.

Both FLs are former/current assassins who work for an escort agency. Both are historical dramas.
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Both FLs have face blindness and are quite isolated initially as a result.
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You Are Vitamins in My Routine is the sequel to You Are the Cream in my Coffee.
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Both involve a semi-dystopian setting and desperate people playing games to the death to win money prizes.

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Both FLs are powerful and skilled in magic, and end up transferring their souls into the body of a weaker, powerless girl. The original body is burned, and then end up aiding the ML as well as being under his protection.

Both are light historical dramas with Chen Fang Tong as the FL. Both have a contract/arranged marriage to true love between the leads, and a heavy love triangle with funny situations between the trio.

Both dramas are based upon the same story and follow the same plot, but one is a mini drama and the other full length.

Both dramas have a FL who is a voice actress who works for the ML.
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Both lead couples have a fated and magical past connection, in which the ML was saved, magically tethered to in some way, and dependent upon the FL in some way he's lacking since then (hearing vs. existing/people remembering him.

Both follow the same plot of a rougher, street smart lead falling in love with an optimistic blind FL, only to learn they are responsible for the car crash that caused her blindness and the death of her parents. One is M/F, the other F/F.