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Wouldn't that suggest two leaks of the same document (one to WaPo, one to the Guardian)? I don't believe that is the case here.

I don't doubt they version things like this, but I do doubt the watermark is easily found. A bit here, a bit there and you can bury a lot of info in a graphic with no one the wiser.

Or someone just decided that a US map would look better for the other briefing.

On the US-map one, the ellipses line up correctly with the cable landings, and the PRISM-partner logos are over the US, not floating in the ocean. Also, the arrowheads on the cable-bundle ellipses aren't all distorted, and the drop shadow on the "You Should Use Both" text displays correctly.

I'm marking this one down to PowerPoint-specific rendering (vs, say, OpenOffice).