This photo shows just how different the cultures are at Wal-Mart and Jet

Marc Lore, head of Walmart's U.S. e-commerce business, and Doug McMillon, CEO of Walmart.

Simply sitting the CEOs of Wal-Mart and next to each other shows you just how different the cultures are at the soon-to-be-wed companies.

In preparation for an interview with CNBC's "Squawk Box," Wal-Mart CEO Doug McMillon threw on a pair of jeans, as he tried to channel the vibe of a relaxed start-up founder.

Meanwhile, Jet CEO Marc Lore dressed in a blazer and a pair of slacks, in an effort to look more corporate. It was so out of character that he forgot to wear a belt.

Their wardrobe differences aside, Lore told CNBC Tuesday that the $3.3 billion combination of the two companies, expected to close this year, is a "perfect marriage."