NAPA VALLEY — Chappellet Vineyard & Winery in eastern Napa Valley today announced the acquisition of former diplomat John Loeb Jr.’s 38-year-old Sonoma-Loeb label, which has been made at Chappellet for two decades. “It’s almost a cliché to talk about a winery sale being a ‘natural fit,’ ” said Cyril Chappellet, owner and managing director. “In this case it couldn’t be more true.” Phillip Corallo-Titus, longtime winemaker for Chappellet and Sonoma-Loeb, will continue to make the both wines. Other terms of the deal weren’t disclosed.