Are zebra sharks the same as leopard sharks?

The problem is the use of common names. The Zebra Sharks (Stegostoma fasciatum or Stegostoma varium) are also sometimes called Leopard Sharks, BUT there is also a completely different species of Shark which also goes by the name Leopard Shark (Triakis semifasciata). They are very different species.

Common names are interchangeable and vary from place to place but the scientific name can be relied upon to always refer to a single species.