You can already see in the bottle picture that even the shades are a bit different. Kiwi Cool-Ada is a bit more yellow-green and In The Lime Light is more blue-green. The major difference is in the finish. Kiwi Cool-Ada is a true neon (matte and all) where In The Lime Light is actually a neon shimmer (with blue shimmer).
For this swatch, I used a base coat of Seche Natural, 1 coat of China Glaze Snow, 3 coats of color and 1 coat of Seche Vite.
Quite oddly, on the nail, it's Kiwi Cool-Ada that comes out darker. I know that most of that is because of the shimmer but it's definitely a different look and you can tell these two are cousins, but not dupes.