The macaroni and ketchup merger of Kraft Foods Group (KRFT.O) and H.J. Heinz Co may prove a boon to the far smaller natural and organic food companies that have seized market share as consumers shift away from processed foods, bankers and portfolio managers said. Brazilian private equity firm 3G Capital Partners and Warren Buffett’s Berkshire Hathaway (BRKa.N) announced a $46 billion deal to consolidate the companies Wednesday, one that will create the No. 3 packaged food maker in North America after PepsiCo and Nestle USA..