That's a good question about the Jazz Life series. There were two Roeling covers with this as the alternate (the other being Ted Curson's Urge). Quite a number of bop sessions were issued in this series - Dexter Gordon, Bud Powell, Howard McGhee's Sharp Edge, etc., as well as pre-bop material. I suspect they were nearly contemporaneous, as the catalog numbers did not change between Roeling and Jazz Life issues.