Let's say I operate a company selling custom tshirts. I have an online ecommerce shop called BuyShirts with products, a few articles on tshirts, etc. On another server, I host a blog called AboutTShirts where I have articles about buying shirts with a few links to my shop. It's a way to drive in traffic.
Now, both sites have their own content but could be considered duplicate if they were hosted together or were the same site. BUT they separated by different domains and different hosts.
BUT let's say I have one Google Webmaster Tools account and it lists both domains (I've confirmed ownership for both). Am I proving to GOogle that I own both and potentially admitting to duplicate content? Would I be wise to move one of the sites to a separate GMT account?