Will the new passport cards have the same ID # as a regular passport?

Would some people have both? K.H., Altadena, California

According to the U.S. State Department, a single citizen can be issued both a passport card and a passport book.  The passport card is only used for entering the United States at land border crossings or seaports-of-entry from select adjacent international destinations: Canada, Mexico, the Caribbean, and Bermuda.  The passport book is still used for all international air travel.  The State Department notes that while a single individual can be issued both passport formats, each one would bear a different serial number.  Both forms meet the requirements of satisfactory evidence of identity for notarization's.