Sharks with White Tips

There are at least 2 species of sharks commonly called “White Tips” because of, naturally, the white marking on the tips of their fins. But take a closer look. The Oceanic White Tip Shark, also called SILVERTIP SHARK (Carcharhinus albimarginatus), differs from WHITETIP REEF SHARK (Triaenodon obesus). Can you tell which is which ?