Everyone thinks the Oreo cookie was made by Oreo. Despite the common belief, it was actually Hydrox who invented the Oreo cookie in 1908. The Oreo cookie that we know today is simply a modification of the Hydrox cookie.
Although the Hydrox and Oreo cookies look very similar, some minor adjustments are the difference between a company that became an unknown and a company that now makes over a billion dollars every year.
When you look at what each cookie looks like, especially from a long distance, they look identical.