Hello. You did not present the two talks to which the question refers, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
It is only possible to answer your question after reading both talks. When doing this reading, you will have to recognize the common themes that they present. The topics of a talk are the subjects that it addresses, that is, they are the subjects that the speakers are addressing through the arguments that each one of them presents in the talk. These arguments are their views on the issues presented. In this case, you need to identify what are the arguments that one speaker approaches in a similar way to the arguments of the other speaker, that is, you need to show the common views that both speakers have on the same topic.
