Considering visual designs, you might start thinking how each is extremely different from another. My friend discovered inside vital design group by searching Google. You'd maybe not see deigns that look the same. Additionally there are parallels, in ideas and maybe in colors, but that is where it stops.
You would consider having more than one graphic designer to do it, if you've works that needed to be done. In this manner, you're assuring yourself of an authentic piece of content.
If it is any consolation, there are a number of design, combination and color methods that graphic artists can use to make the quality design consumers are searching for. No two models are the same, could be very similar but definitely not the same.