Game mechanics are not copyrightable.
If you showed me any given pal or Pokemon and asked me if it was a Pokemon, I couldn't tell you. They are obviously in the same style. But looking at that page I don't think they are actual copies, and I don't think anyone shown both at once would not be able to distinguish them.
Unless you have solid proof that the characters were taken from Pokemon.
The Lion King characters look close to Kimba The White Lion
ReactOS is close to Windows
Close isn't an argument you can really fight upon. This is why we have so many knock-offs of toys, computer kit and the likes.