I noticed something in Investigations

The first game I played was the investigations collection, so I obviously knew about that before playing the Phoenix Wright trilogy. As I was playing rise from the ashes, I saw dialogue that might have been referenced in investigations. In the criminal affairs dept there's a character at the side of the screen writing a novel, and they write "I know! The killer used a cassette tape! What a crafty trick! That gunshot was a fake!"

In Turnabout Reminiscence, this method is used almost exactly. (It wasn't exactly a cassette tape, but it's still close enough.) Is this just a coincidence, or am I on to something?