I have never purchased or worn blue contacts before. I was skeptical that cool colors would be visible on darker eyes, but I didn't have to worry! Aqua is a warm blue-green, while Sky is a cool light blue.
Like the other Scandi lens, Scandi Aqua has its color concentrated at the center, whereas Spanish tends to have a pattern that feathers out towards the edges. They're difficult to compare since the colors are so different.