Here's a few pics:
Both games
Front of Wai Wai World 2
Back of Wai Wai World 2
Both are legit official carts. I have no idea in terms of a price I'd be asking, but I'm familiar with the rarity of the carts. I need to play them and decide 100% whether I want to part with them or not, but I'll certainly consider any offers you are willing to make on either or both via PM!