Upgrading Pioneer HU to support Android Auto.

[Starscream59]

So today I purchased a Pioneer AppRadio 4, with the belief that it supported Android Auto. But after finally completing the install to realize it did not. The next model up (Pioneer AVH-4200NEX), does support it. I was wondering if both models use the same harness, which would make the install much easier, so I can just purchase the new HU and return the old with the new harness. Anyone who'd be willing to shed some light on this, it would be most appreciated.

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