1.Yes
2.a How easy? Depends on how much you can afford...
2.b Airplane management cost varies by a factor of 100 I would say. Depending on the AOC holder, the kind of operation, the type and size of your aircraft, and a dozen other factors. If you bring a BBJ to a company that has been operating only Kingairs before will open a whole new world to them. To the point that they may even let you fly under their AOC free of charge. On the other hand, an operator of a dozen BBJs will probably charge you the same amount for your Kingair that he charges the BBJ owners.