swap an 03 non JBL for the 06 mp3 indash?

[mxnmtber]

Anyone know if I can swap out my 03 non JBL indash with the steering wheel controls for the 06 with the mp3/wma logo on it? I really just want an mp3 capable system...I know you can get an adapter for an ipod that plugs into the CD changer and use the tape interface...thanks for the help...