Yes, it is. 'Charlie Charlie' is often claimed to be based on a true story, which involves some sort of supernatural or spiritual encounter with an entity named Charlie. However, there's no scientific proof to back it up.
Charlie Bartlett is not based on a true story. It's a work of imagination crafted by the writers to engage the audience with an interesting plot and characters.
No. The Charlie Charlie real life story is not based on true events. It's a superstition - based game. There's no evidence to suggest that there's a real 'Charlie' or any supernatural force involved.