Lady Revenger Returns from the Fire

Different plots but the FL undergoes a face swap and goes through trials to survive.
The ML in both recognises the FL in both dramas through certain mannerisms and gestures.

The main idea of both dramas is that the main character literally swaps faces with someone else. In LRRFTF, the main character's family tried to kill her, and she swaps faces with someone to get revenge and find out the truth about what happened. In NF, the main character didn't choose to get a new face, someone forced him to. He is also trying to discover the truth about the past event. In both dramas, the protagonists search for the truth and investigate while pretending to be the person whose face they have.
In fact, apart from that, these dramas are very different, but they do have some points in common.

Both are historical dramas in which the FLs want to find the truth behind the conspiracy. Both Fls want to clear their names.. .
between the case, they fall in love.....

Both dramas have the same actor and actress paired as the main couple, so if you enjoyed their chemistry in one, you will enjoy it in the other.

both FLs are wronged and killed get their faces swapped with another woman and become part of that woman's family
Both are historical drama
Both ML is a military man
Both FLs are betrayed and seek revenge on those who who wronged her

Both FLs are wronged, seemingly killed in a fire, get their faces swapped with another woman, and become part of that woman's family, assuming her identity. They then continue their quest for justice under that identity with the help of the ML who is a military man.

Both FLs are seemingly killed but have their faces/identities swapped with another woman who has a brother.

Both are historical mini dramas in which the FL swaps faces with another woman and returns for revenge against those who wronged her.

Both are historical dramas in which the FLs are betrayed, seemingly killed, and have their faces changed by a man who finds them injured and saves them.