I'm haven't walked in their shoes, but I work with quite a few nurses who worked in AICU, and one who still does (part-time AICU, part-time NICU). I know that there is quite difference in mind-set as far as care goes. The gal who currently does AICU and NICU says NICU is "easier", whatever that means!
Sorry I can't give specifics, but point being, it has been done! Good luck to you