Aside from them both being well-to-do white guys, who occasionally dabble in drugs, I'm not really seeing any substantial similarities between the two characters. They behave like two entirely different people.
Recently Played (out of ten):
Watch Dogs (PS4)- 6.5
Mario Kart 8 (Wii U)- 9.5
Wolfenstein: The New Order (PS4)- 8 Shovel Knight (Wii U)-9