The packaging for the dual packs is the same across the line, with both figures being prominently displayed with their interchangeable accessory on a blister card. The back of the packaging features additional characters available (at the time) and how the pieces can be interchanged, even with the larger Super Hero Masher figures.
Venom has his trademark tongue hanging out of his mouth, sharp teeth exposed. Spider-Man 2099 is a simple redeco of the Spider-Man figure, but with a new head. Both figures fists and head are interchangeable.
Venom comes with an over sized hand that appears to be forming some sort of sharp weapon? It is a symbiote after all so Venom can do whatever he wants. Spider-Man 2099 on the other hand also comes with a hand, but this one has a blue spike (?) on it. I don't recall anything like that from the comics, but whatever, it's a new part to use w/ other figures.
Speaking of other figures, I had Rocket Raccoon and Groot nearby, along with a few other parts so I mashed them all together to form these guys.
These little stylized figures on their own are pretty cool, but the fun factor really kicks in when you start mix-matching the various body parts. This means that once you buy a set you'll want others and I'm sure Hasbro was banking on that. Too bad these didn't catch on more than they did when they were on store shelves because they are a lot of fun. They can still be found online (eBay) fairly easy if you'd like to try them out, but don't blame me if you find yourself trying to track down multiples.