Okay, enough with Hollywood. From Magic Knight Rayearth 2:
Since even the question is a spoiler, Spoiler-GARDed(tm) for your protection.
MKR2 Spoiler wrote:Since Presea died in the original MKR anime but not the manga, her role in the second series was taken on by her identical twin sister, Sierra, posing as Presea. However, there's one physical difference between the two of them.
What is this difference?
Hint: Caldina commented on this distinguishing mark in the baths.