Here's some pics of my small guys. The ID shark is around 8", and the Pangasius shark is around 6.5". The pic together Pangasius hypothalamus on top, and Pangasius pangasius on bottom. The pangasius sharks are catching up quickly.
I have no opinion on what kind it is; however, stores label them as what the wholesaler tells them it is. It's not uncommon for them to sell a fish under the wrong name. Either way it's a nice fish.