Here is a paragraph from Carol Kaye's web site confirming the third David Cohen as a studio musician in southern California (although he did teach guitar to some folkies).

{quote, Carol Kaye}"These are some of the musicians playing on your favorite past recordings, movies, TV shows:

Guitar:Rene Hall, Howard Roberts, Bud Coleman, Tommy Tedesco, Barney Kessel, Tony Rizzi, Billy Strange, Glen Campbell, Allen Reuss, Bobby Gibbons, Bob Bain, Dennis Budimer, John Gray, Bill Pitman, Al Casey, Al Hendrikson, Irving Ashby, Mundell Lowe, Mike Anthony, Lou Morell, Al Viola, Ray Pohlman, Arthur Wright, Nick Bonney, Toots Thielemans, Don Peake, Charles Wright, James Burton, Dean Parks, Mitch Holder, Mike D'Asey, David Cohen, Jerry Cole, Charley Chiarenza, Neil LeVang, David T. Walker, Larry Carlton, John Collins, Jim Helms, Al Vescovo, Louie Shelton."