I don't think they use the book as a guide, but rather, any and all oppressive and totalitarian systems generally follow the same pattern. "1984" reflects that pattern in a fictional setting, but the pattern exists and has existed independently for centuries.
I tend to agree with this. I think cults like the JWs often evolve slowly (though, admittedly, some cult leaders seem to have a more purposeful approach to using BITE control on people) by the leadership trying various things and the stuff that works they keep and the stuff that doesn't they discard. Due to commonalities in the way people's brains are wired, cults tend to evolve following certain trends that most of us know to follow the BITE model for control.
Animal farm is another great book if you enjoyed 1984. That one is uncanny in similarity to the JWs as well - particularly in the way they capture new light and the unsaid rules of the cult.