No. Of course not. Don’t be absurd. 

However, this is an actual theory put forth on the Game of Thrones mega-fansite Winter Is Coming, which tops out at 2,300 words, and which almost certainly exists solely because the actor that played Benjen and the second guy who played Daario look vaguely alike.

The theory does wisely concede that the Benjen-as-Daario theory doesn’t work for the show, seeing as two similarly bearded yet completely different actors play the roles. The argument sticks to books, detailing all the ways that the two characters don’t completely contradict each other, excluding of course the fact that they act absolutely nothing alike and that the idea is dumb.