Fandom Friday: How can iCarly share the same universe as Henry Danger?

I don't understand how iCarly can be in the same universe as Henry Danger on Nickelodeon. On Game Shakers, the characters Triple G, Hudson, Babe and Kenzie are really big fans of the iCarly TV series to the point that they snuck into the hotel room of actor Nathan Kress (who played Freddie Benson on iCarly) to ask him questions about the show on the episode Game Shippers.

Game Shakers season 2 episode 17: Game Shippers