if your just trying to swap the springs it's not going to work, the front are wound in different directions for the different years. If your swapping the whole suspention then they will fit. By springs and shocks you must mean coilovers and those will fit on both years. also anytime you change your suspentino your alignment is going to change....fact of life not car.
if you change out the spring AND shocks from the 02-04 and put them on the 05/06, then it will fit. BUT if you just take the springs from the 02-04, then they won't fit on the 05/06. something like the springs are wound a different way, something something
also, the alignment goes out of whack because of how our suspension is set up. I am no pro at this info, but i'm pretty sure it's been covered before. maybe someone with more knowledge can chime in. if not, i'm sure you can find the answer by searching