I've seen that too, in my experience, it seems that the 3' thin wall bulk tubing seems to be the most maliable, while the 1' tubes in the red cardboard packs is a harder thin wall tube that doesn't like to bend, then they have a thick wall 7071 alloy tube that you can cut threads into!
You are actually taking a look at pictures of two cars that look nothing alike other than a shared antenna and saying that they are indistinguishable from each other yet two cars that have a similar silhouette and the exact same roof options look completely different?
One big difference, they'll come back in and buy parts to make them quicker, faster, more durable, optimize them for what they're running on, get different shells and paint them, and go right back out and drive the snot out of them.
If you bother to learn what new what new car tail lights look like as you would have back in the "good ol' days", you'll find they aren't too difficult to tell apart......moreso now than in even the recent past.
I've read elsewhere that the '99 Concept Charger will be the basis for the next generation Charger, that there will be a GLH badged Dart, and a Hellcat powered Grand Cherokee, supposedly even a plug in hybrid Minivan!