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I believe the Premium sound also comes with the upgraded cluster, so it'd probably have that stuff for the radio, and the upgraded cluster probably comes with the different harness.

On the older vehicles, the Bose sound system had it's own harness that was unique to the Bose equipped vehicles due to the internal amps in each speaker. So I could see the difference happening quite easily.[/QB]
I'd bet that the instrument clusters are the same. The software that they are loaded with ahs different features enabled. From a financial perspective, you don't reinvent the wheel. As for the connectors on the amplifier, I might have a wee bit of knowledge of Bose amplifier.