Differ and Talk about

Differ verb - To be unlike; to not be the same.

Talk about and differ are semantically related in speech topic. In some cases you can use "Talk about" instead a verb "Differ", when it comes to topics like debate.

Talk about verb - To consider or examine in speech or writing.

Differ and talk about are semantically related in speech topic. Sometimes you can use "Differ" instead a verb "Talk about", if it concerns topics such as debate.