First Interstate Bancorp said National Enterprise Bank of Washington, D.C., agreed to change its name to First Interstate Bank of Washington, D.C., becoming the first bank on the East Coast to agree to a franchise agreement with First Interstate . . . Diamond Shamrock R&M Inc. said it has agreed to pay $15 million to the federal government to settle claims that the petroleum company overcharged for crude oil . . . Pacific Lighting has completed the sale of its land development subsidiaries to two investment groups for $325 million.