Grizzly bear play

Guys is this Shinstay and Samson playing or Shinstay and a new grizzly? Because we know that Sam has a darker coat but these two had the same coat color, confused

Nothing has happened to Samson. He is still there, alive and kicking from what I know. Maybe it was just the way the light was hitting his fur that made him seem lighter, or that he was dusty, or maybe his coat is just getting lighter with age.