The left-hand pack has chicken-flavor ramen noodles, while the pack on the right has yakisoba style noodles. Honestly, I don't know the difference yet. But these two packs have two different flavors. The chicken flavor in the ramen pack is apparent, and the noodles taste a bit saltier. The yakisoba noodles have more spices which in turn makes them more flavorful.
I'm not sure which one I like more, but I think the chicken ramen noodles in the orange pack have a slight edge. And these tiny packs have made me more interested in trying other (full-size) bags of similar snacks!