I need to compare doublethink and Newspeak in a paragraph. What is one quote for each to show their differences and similarities?

In 1984, there are some differences between doublethink and Newspeak. Doublethink, for example, is the practice of holding and accepting two contradictory ideas at the same time. The Party slogan, "War is Peace," is one example of doublethink, because war and peace are opposites, and, therefore, cannot be the same thing, but the idea is accepted anyway.
As Winston comments in Part One, Chapter Three, doublethink is all about controlling the perception of truth and reality:

"Reality control," they called it: in Newspeak, "doublethink."

In contrast, Newspeak is the official language of Oceania. It is very similar to English, but has been whittled down to its most basic form. As Syme explains to Winston in Part One, Chapter Five:

We’re destroying words — scores of them, hundreds of them, every day. We’re cutting the language down to the bone. 

Although doublethink and Newspeak are very different, they share one similarity. That is, their purpose. Both doublethink and Newspeak are designed to brainwash the people of Oceania, so that the Party has total control. Doublethink controls the information that people believe, while Newspeak narrows down the range of thoughts, making it impossible for people to think anything negative about the Party.