Interesting.
I always thought there weren't enough variety in heroines in "villainess" stories. Feels like the majority of the time they are just role swapped with the villainess and take their place as the antagonist. Sometimes to varying degrees and not always malicious, but still against the FMC.
Other times they continue being the heroine like always, reincarnated or not, and have no particular influence in the story at all, or come to an understanding with the "villainess" and become friends to be protagonists together.
This adds some different dynamics to a heroine who was reincarnated and doesn't realize they aren't the main character, but wants to be, and may or may not fully accept the unexpected changes she can't control.