I've a PZQ60-12011 (out of a 2007 Seca) that has a 20pin plug at the rear of the unit, and want to replace it with a PZQ60-00511 (from a later model Kluger) that appears to have a corresponding 28pin plug at the back of the unit. The harness in my car is 20pin. Will my 20pin harness plug into the 28 pin plug at the rear of the PZQ60-00511? Or do I need an adapter? Any advice you can give I'll really appreciate! Thanks.