AFAIK the a/c controls are the same ( too far into a bourbon bottle to look it up ATM)
Radios look the same, but the rear chassis mount on the right side is in a different location on the 65 and 66. Don't remember if there is an internal electrical difference between the 2 on the AM radios, but the 13 transistor 66 am/fm is a much better design than the 11 transistor 65 unit. But the 66 am/fm units are more prone to blowing the AM RF amp transistor than the poorer performing 65 units.
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65 Bonneville Brougham 4DHT
65 Grand Prix 2DHT......now parts
65 Catalina 2+2 2DHT
65 Catalina Safari 4DSW
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