The original question had to be edited. Political ideology in both works is shown to be the same. Centralized authority that uses its power to control the lives of a citizenry, destined to have their dissent silenced by any means necessary is the ideological frame of reference in both works. Yet, the manner in which this is shown in both is fundamentally different.
The political ideology of Big Brother in 1984 is shown through a third person narration that clearly understands what Winston experiences living under a totalitarian regime. The style that Orwell appropriates in relaying this political ideology is one of fear and absolute control. Orwell discusses the technology used, the manner of torture by finding one's darkest fears to manipulate them, and the idea that government benefits from a silent body politic. In articulating these, Orwell displays a controlling political ideology in the most fearful of ways. The depiction of Oceania as a burned out and extinguished arena where hope and promise have been replaced with destitution and drab add to this. The style in which political ideology is shown to be one in which there is complete fear of the future. There is little hope for the promises and possibilities of human freedom in a setting where Big Brother seeks to control each and every aspect of being.
The same third person narration is evident in Animal Farm. Yet, in the use of allegory, Orwell is able to evoke the same fear in government that controls so much of individual aspects of being. In the employment of allegory, the resulting effect is one in which the reader feels more empathy and a sense of sadness at the political condition of the animals on the farm. The death of Boxer, the futility of Benjamin, and the emotionally forlorn condition of Clover all evoke a sense of sadness in the reader in terms of understanding political ideology. Political ideology is relayed through terms of fear and dread in 1984. In Animal Farm, there is a melancholic reflection that results from examining the depiction of political ideology.