Some of the ways that a person can develop a theme is:
This refers to the central message of a story which is used to structure the story or article to teach the readers some moral lessons.
With this in mind, to be able to accurately compare two texts, it is important to identify the themes of the two of them and then see if they have any similarities, then monitor how the themes helps to structure the stories and advance of the plot.
Please note that your question is incomplete so I gave you a general overview of the concept to give you a better understanding.
Read more about themes here:
https://brainly.com/question/25336781