No YT-1300 freighter appears in The Phantom Menace. Although many have looked for it, it isn't there. Many easter egg sites died to bring me this information.
The ship in the second picture, from Revenge of the Sith, has been confirmed by George Lucas as actually being the Millennium Falcon.
There is a archived copy of the page that used to be on StarWars.com here (thanks to Adamant).
It was speculated that the Falcon would make an appearance in Revenge of the Sith to further tie the prequel trilogy to the original trilogy, and the ship did indeed make a cameo in the movie. At the beginning of one shot closing in on a docking bay on Coruscant, a freighter is seen flying in to dock. George Lucas confirmed that it was the Millennium Falcon itself and not just another ship of the same class.