Can I install a factory headunit from an '03 with the in dash changer into my '02? Are the dash openings the same? Will I need to butcher the harness?

Thanks for the help in adavance from a newbie. Just purchased my Lightning last night with only 12500 miles on it. Bone stock for now...

 

I have the 6 disc changer in my 01. Had to trim a bit of plastic but it does fit and no rattles. My 6 disc changer works with it just fine. Put it in 1 1/2 yrs. ago! The plus is you get a total of 12 disc's. Artie