Answer: They’re both formatted for one column.
In his audio article, 6 Ways to Increase Conversions on your Web Pages, Nick Usborne, one of my favorite copywriter colleagues, talks about the multitude of testing he’s done on landing pages and column formatting. Long and short, the one-column format converts best every time.
This explains the stubborn effectiveness of everyone’s favorite (or not) online long-form sales letters. Garish? Sometimes. Too long? Perhaps. But they work, in part, because there are no other distractions for the reader. Even with all the insets, widgets and gadgets, each is firmly ensconced within the one column. Further, the one-column format lets readers know that there’s more to look for below the fold of the first screen. The convention of the letter-like, one-column design tells them so.