That looks pretty similar. However, it seems different inasmuch as hiring workers is just like buying guns. You aren't hiring real people to work for you. Also, it doesn't appear to be nearly as large a world. It's just a single city like the original game, whereas this game has you traversing the world, with different things to do in different cities (aside from different local drug availability and prices). For example, in Vegas you can gamble or join a fight club (where you fight against real members and take money from them if you win).
I don't know. The one on Facebook looks better to me, and certainly benefits from a much larger userbase, but they're probably both fairly similar experiences.