1993 Factory Cd player NOS

Hi, i have a 93 factory cd player that is NOS. I have a 91 mustang. The wiring harness that plugs into the back of the radio is different then the one on the cd player. can i just swap over my amp and amp to radio wiring for 93 parts? I know the 93 amp is under the pass seat. where is the amp in my 91? Anybody have any info on this? thanks And do i need to buy the premium speaker package? or will my stock 91 speakers work just fine? thanks

Or could you just find out with wire is which wire is which and connect them.