Just to clarify, it's the 2004 MODEL YEAR that saw the change. The vehicle was sold in late 2003. So you could buy the new (current) body style Prius in 2003, but it was a 2004 model year vehicle.
The 2003 model year vehicle is the same as the 2001-2002 model year. (And, for that matter, essentially the same body as the Japanese 1999-2000.)
Owner of 'Eeyore', a 2004 Prius. Only took 2 days from start of search to delivery.
8 years of ownership, 115,000 miles, about 40 MPG average at present.