Defer is to put off or to choose to do something at a later time: “It is so easy to defer one’s word to the next day.”
Differ is to disagree: “People generally differ in their opinions about political issues.” It also means to be unlike.
“We almost always seem to differ with each other on political issues.”
2. To be unlike: “Even though they were twins, they tended to differ from each other in hobbies and sports.”
“The parents differ in their approach as to how the children should be disciplined.”
I beg to differ with you; I did submit my application to defer my taxes until next year.