She also adopts a different secret identity from her counterpart .
Though they are biologically the same person , Power Girl behaves as an older , more mature , and more level - headed version of Supergirl , with a more aggressive fighting style .
Power Girl also adopts a different secret identity from Power Girl 's counterpart .
Though they are biologically the same person , Power Girl behaves as an older , more mature , and more level - headed version of Supergirl , with a more aggressive fighting style .