With continuity almost as messed up as Hawkman, it's a question that has plagued DC writers since time immemorial.
Luckily Donna herself is here to clear the whole thing up:
Thanks Donna we appreciate you clearing that up, but stealing your tough-guy talk from Vinnie Jones?
Really Donna? Vinnie Jones? What were you thinking?
(This bit of continuity-nerd snubbing come to you from the glorious mess that is Countdown To Final Crisis #15. This issue also features Kyle 'Green Lantern' Rayner explaining to Ray 'the Atom' Palmer about the evil machinations of Bob the Monitor...I'm not kidding...Bob.The.Monitor)