Columbia OL series – Pal Joey

Columbia had, for a while, a numbering system starting with OL, dedicated to soundtracks or shows. Many of these were records that also appeared as ML with the same numbers. Here is OL4364 in three color variants, plus its ML4364 equivalent, plus the same record designed by Bob Cato instead of Steinweiss. The Cato is an overprint, OL4364 is overprinted on ML4364 on the front cover. All mysterious to me, but fun. Which came first, Cato or Steinweiss? Which came first, ML or OL? If anyone knows, please let me know.