Everythings possible with the right know how. What i would do is find an 03 in the bone yard and get the harness leading to the radio. Next you`ll need a test light and a wiring diagram for the radio you`re trying to install. Cut your 93 connector off and rewire according to the 03 diagram. Have some fuses handy if you`re not familiar. lastly a lot of patience. My only concern would be if the dept of the 03 disc changer was too great to fit in an 93 dash