Hi Lynn, I'd say he's the same person. Because of the instructions given out when the fellows filled out their World War I application papers, their birth date is often a year off.
You can request his obituary from: Stock San Joaquin Library, sirsi.stockton.lib.ca.us
OR San Joaquin Genealogical Society, rootsweb.ancestry.com/~sjgs/index.htm . An obituary is often a good way to identify if the person found is truly the person you're looking for. Successful Searching!