Yes, other than color and air cleaner, they were physically identical. I've read some 383 Magnums in 69 did come through painted turquoise if equipped with A/C. The specs on the 383 Magnum was 335 hp at 5,000 rpm, and 392 lb-ft of torque at 3,600 rpm. In a nut shell, they took the 440 heads and cam, and stuck them on/in the 383 block.
The Clean Air Package was a hose that came off the air cleaner to a cap on your valve cover. It was a PCV system where you vent the crankcase. Common place now adays but back then pretty revolutionary in cutting down on air pollution. The carb was also a "leaner carb", the mixture screws were preset then filled so you couldn't mess with the settings. You can see the hose coming off the air cleaner in the pic.