A-body Inner wings

out of curiosity, do certain A-Body cars share the same inner wings? Ie Duster and Valiant of the same year, Dart and Valiant of the same year? Is it just the exterior panels which differ?

I assume you mean the inner fender well?

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If so, than yes. The inner fender is interchangeable from any A-body of a given year. And realistically, they’re interchangeable from any A-body 67-76. There will be some year specific changes, like when the “bump” was added to the passenger side inner fender for the charcoal canister etc. But any A-body will fit, and any A-body from the same year will be “correct”. Most of them would be correct for at least a couple years.