Has anybody played for both the Kansas City Athletics and Kansas City Royals baseball teams?

No one. However, Bob Ferrick, Sr. played with the Philadelphia Athletics, coached with the Kansas City Athletics and was the Farm Director of the Oakland Athletics. The only other person affiliated with the team in all 3 cities was Lew Krause, Sr. who pitched with the Philadelphia Athletics and was a scout for both the Kansas City and Oakland Athletics.

Ironically, Bob Ferrick, Jr was a columnist for the Philadelphia Inquirer and Lew Krause, Jr. was a suburban Philadelphia schoolboy bonus baby pitcher. They both grew up in the Philadelphia area based on their Dads affiliation with the A's. Krause, Jr also pitched for the KC and Oakland Athletics. He signed with the A's because his Dad was their scout. It was reported that Charlie Finley hired Lew Sr in an effort to sign his son.