Will a stereo from a 1999 Honda Fit in to a 1995 Honda?

The wiring harness from the 1999 stereo has a 21 prong plug and the 1995 has a 14 prong plug you can purshase a harness from Honda but it has to be hadrwired to the exsisting wiring but don't screw it up, go to Honda and get a wiring diagram for the both of them to match up the wiring you need to make it work.