Yes, same person.

Clifton (William August Marburg) and Paul Clayton (Paul Clayton Worthington) did an album together ('53-55, not sure). It was the recording debut for both, but it was not released at the time. Bear Family put out an LP in the late '70s from the Stinson tapes, which, oddly enough, was still available as an LP last year.

In previous posts, Bob Coltman said he is working on a (long overdue) biography of Paul Clayton. Anyone with good stories is encouraged to contact Bob Coltman.