In what ways can Fahrenheit 451 be related to 1984?
Another strong similarity between both works is the idea of what happens when a central authority figure has no institutional checks or limitations. The most evident reality in this setting is the idea of being able to control how people perceive their own reality. Through the burning of books in Bradbury's work or through mechanisms such as the thought police in Orwell's, both works feature a reality where collective security and control have sacrificed individual expression. At the same time, both central authorities in the novel have little, if any, plausible resistance and opposition. Both social and political orders are predicated upon submission and obedience as opposed to active participation and voicing dissent.
The major similarity between these two books is that they are dystopian visions of what the future will be like. In both cases, the people of a future society are stuck in a world that is quite horrible. In both cases, people cannot or do not really have any thoughts. In both worlds, people do not really have much in the way of feelings for one another. To me, these are the major ways in which the books are alike.
Of course, the societies get to be this way in very different ways -- 1984's society is much more coercive than Bradbury's. In Bradbury's book, the people have chosen to be this way whereas in Orwell's, they have been forced.
In addition to the above, the two novels present systems of institutionalized control. There are strict laws and rules governing people's behavior and thoughts; however, the systems remain ones based on hierarchy. Also, in both novels the protagonists Winston and Guy are dissatisfied with the control that their societies exert on people, so they attempt to find ways to usurp the systems.