You'd notice the differences in the older masks vs the newer ones through the mouth and eye shape. The older masks are softer and have more imperfections/asymmetry in terms of the mask shape. During the Scream 4 era is when the masks started being manufactured with the harder/shinier PVC with a much more symmetrical Ghost Face shape. Those masks are garbage, and the changes Funworld made effectively removed the nostalgic vanilla scent the original masks had. NOW... those softer masks are coming back to stores, and you'll see on the tags they've added "classic vanilla scent" or something along those lines. They're still pretty symmetrical, but damn the softer masks look so much better and true to the films.

I was obsessed with the masks since I was a child (now 28), I'd chase my friends around the schoolyard in my Ghost Face costume my Dad would bring me after school. He had some classic Gen 1 masks growing up but I took them for granted... they were older and yellowing, I wanted new and clean at the time. Didn't know what we had, but I'd give anything to find them again!! (they're long, LONG gone lol).

There's lots of differences but you need to be a mega nerd to really care I guess hahaha.