Rooney Mara vs. Noomi Rapace: Who Will Be the Grittier 'Girl With the Dragon Tattoo?'

Rooney and Noomi: sure, their names kind of rhyme, but the similarities may end there.

Rooney Mara is reportedly taking major steps to inhabit the role of Lisbeth Salander in David Fincher's American adaptation of "The Girl With the Dragon Tattoo." According to The New York Post, the 25-year-old actress has pierced her nipples and dyed her hair to play the computer hacker turned violent heroine.

A representative for Mara declined to elaborate on specifics, but told ABCNews.com that "Rooney's look as 'Lisbeth Salander' will honor the integrity of the character as described in Stieg Larsson's books."

Except that Noomi Rapace already did that: she won Sweden's version of an Oscar for portraying a ruthless, raw (and, more than once, vividly raped) Lisbeth in the original "Girl With the Dragon Tattoo" movie, which is based on Swedish author Larsson's "Millennium Trilogy" of thrillers.

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Below, five facts about both actresses. Which one is better suited to be the "Girl With the Dragon Tattoo"? We'll probably have to wait until the American movie hits theaters in 2011 to find out.

Rooney Mara

Rooney Mara and Jesse Eisenberg in "The Social Network."

1. She can throw verbal jabs. Mara may be best known for playing Erica Albright, Mark Zuckerberg's scorned ex-girlfriend in "The Social Network." Memorable line: "You're going to go through life thinking girls won't like you because you're a nerd, and I want you to know from the bottom of my heart that's not true. They won't like you because you're an a**hole."

2. She's a sporting gal. Mara comes from a line of sports greats. She is the great-granddaughter of Pittsburgh Steelers founder Art Rooney, Sr. (on her mother's side) and New York Giants founder Tim Mara (on her father's side). She's also got acting in her blood -- her older sister is TV and film star Kate Mara.

3. Acting's not her only passion. Mara graduated from New York University in 2010, where she studied psychology and international social policy. She continues to channel her interest in helping others by overseeing Faces of Kibera, a charity that provides housing, food, and medical care to orphans in Kibera, a Kenyan slum.