NICKNAMES

Trump: The Donald

O’Leary: Mr. Wonderful

AGES

Trump: 69

O’Leary: 61

HAIR

Trump: Strange

O’Leary: None

BIGGEST FAN

Trump: Donald Trump (we can only assume)

O’Leary: Kevin O’Leary (we can only assume)

NET WORTH

Trump: Trump says $10 billion, but Forbes magazine says $4.5 billion and Bloomberg guesses closer to $2.9 billion.

O’Leary: O’Leary hasn’t said, but the most common — and totally unconfirmed and possibly horribly inaccurate — guesses on the Internet range between $300 million and $400 million.

TV SHOWS

Trump: The Apprentice, Celebrity Apprentice.

O’Leary: Dragons’ Den, Shark Tank, The Lang and O’Leary Exchange.

BOOKS

Trump: The Donald apparently writes day and night. His books include The Art of the Deal, How to Get Rich, The Art of the Comeback, Never Give Up, Think Big: Make it Happen in Business and Life, Think Big and Kick Ass, Think Like a Champion, Think Like a Billionaire, Crippled America: How to Make America Great Again, Surviving at the Top, The Best Golf Advice I Ever Received, The Best Real Estate Advice I Ever Received.

O’Leary: The ex-Dragon’s writing interests are confined to dispensing cold hard truths: Cold Hard Truth on Business, Money & Life; Cold Hard Truth on Family, Kids & Money; Cold Hard Truth on Men, Women & Money.

HOW DID THEY GET RICH?

Trump: Trump was handed control of his father’s New York real estate empire in 1974. He’s had his ups and downs, including four ventures that filed for Chapter 11. But he wouldn’t be stopped, and in addition to his gigantic real estate portfolio, he’s put his name on all kinds of products, including ties, suits, wallets, eyewear, beds, mirrors, chandeliers, bottled water, and cologne.

O’Leary: He took a $10,000 loan from his mother to start an educational software company in his basement. It became an industry giant and was sold to Mattel in 1999 for $4.2 billion. He’s in the wine and investment fund business.

SOME REVEALING QUOTES

Trump: “Show me someone without an ego, and I’ll show you a loser.” (Facebook, Dec. 9, 2013)

“Robert Pattinson should not take back Kristen Stewart. She cheated on him like a dog & will do it again — just watch. He can do much better!” (Twitter Oct. 17, 2002)

O’Leary: “Here’s how I think of my money: As soldiers. I send them out to war every day. I want them to take prisoners and come home, so there’s more of them.” (Biography page on ABC.com)

“I understand what he is doing with the media, and you can certainly claim I am trying to do the same, but I am not Donald Trump.” (Interview with The Canadian Press, Jan. 14, 2016)

SLOGAN

Trump: “Make America Great Again!”

O’Leary: He reportedly told a CTV reporter Thursday: “Let’s make Canada great again.”