Fangio, the longtime NFL assistant coach, had never met the Harbaughs before John Harbaugh retained him on the Ravens coaching staff in 2008. After two seasons with John Harbaugh, Fangio moved cross country to join Jim Harbaugh's Stanford staff as defensive coordinator.
"I'm probably the person that has the most perspective on that because I was with John his first two years in Baltimore and worked closely with him there in his first head-coaching job," said Fangio, who is currently the 49ers' defensive coordinator.
"And, obviously, I've been with Jim last year at Stanford and the transition coming over to here and everything that's involved with that."
Jim Harbaugh and John Harbaugh were born 17 months apart and had a coach, Jack Harbaugh, as their father. But they are not exactly carbon copies, Fangio said.
"And I would say about 30 percent of them is similar, being that they're from the same family, same parents and all that," Fangio said. "But 70 percent of them are very different. They're two very different individuals, two very different, in most cases."
And how, exactly, are they different?
"That's top secret," Fangio said. "That's my information and I'm keeping it to myself."
Never knew Fangio was in Baltimore so long.