Mimic filefish or Saddled pufferfish?

We’ve taken plenty of photographs of saddled pufferfish over the years, or so we thought.  It’s very easy to confuse them.  They are the same size and are usually seen in pairs around the same depths.  The puffer fish is poisonous and has few predators, so why not mimic a pufferfish.

Mimic filefish (female), Dauin, Philippines

Saddled pufferfish (male), Cook Island Marine Reserve, NSW, Australia.