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The holes drilled is what makes them non-interchangeable without of course drilling more holes. During frame rail manufacture, these holes are easily placed with punches (old) or plasma cutters (new). Adding holes later with mag drills is a pain in a manufacturing environment. With certainty...

By "stocks", that article is referring to baskets full of crossmembers, air tanks, tail lamps, etc, that are shared between the trucks. The frame is not the same.

Where did this info come from? It is typically twice the work to disassemble an old truck, blast and paint the frame, as it is to just form new rails from shiny new steel.