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!
I work for the St. Charles HobbyTown, we have a good selection of paints, supplies, tools and kits, some of which are way better than retail priced. We even have a bunch of 1/16 and 1/25 snap General Lee kits!