Heh, yes, but both will give a signal once they're done, and that's really all that matters, right? FXPs doesn't give any real indications of when it's done anyhow, just a very tentative estimate based on the preceeding files.
Well, could not you ask whoever designed the new icons to simply change the colors of the tray icons? I can't imagine it would be very hard, although my graphic experience is scant at best.