The movie Jack Ryan (featuring Chris Pine as Jack Ryan) is based on the character Jack Ryan created by the late novelist Tom Clancy.
The new Jack Ryan movie is an origin story, not derived from Tom Clancy’s novels. It features an earlier point in Jack Ryan’s career, namely, Jack Ryan, a young covert CIA analyst, uncovers a Russian plot to crash the U.S. economy with a terrorist attack.
The movie Jack Reacher is based on the series of books by Lee Child and stars Tom Cruise.
Both the Jack Reacher and Jack Ryan the movies are released by Paramount Pictures.
Jack Ryan was originally scheduled for release on Christmas Day 2013. Its release date was pushed back to Martin Luther King Weekend to make room for the release of the Martin Scorsese movie The Wolf Of Wall Street on December 25, 2013 (which had originally been scheduled for release in November 2013).
UPDATE – October 2, 2013 – Tom Clancy, author of the Jack Ryan novels, died.