The only difference between the 2003 J-360 and the 2004 J-355 is 5 less jets. everthing else is the same. they did not change the control panel and that model always had fiber optic waterfall lights. yes they changed the model numbers by adding a 5 to the end
2003: 310,320,330,340,350-380, 2004 315,325,335, 345( which was the 350) 355, (which was the 360), 365( which was the 340) 375,385.