I am not familiar with these works, but took a quick glance at them online. Even with that, I can't speak specifically to the assigned task, but can offer you some general suggestions of what to look for when preparing to write a compare/contrast essay.
First, you may want to make a quick summary of each work. What is the author talking about? How does he (in this case) approach that topic? Summarizing each work will help you see what are your most basic understandings of the work to be compared. Plus, you may find it easier to move from there into a more in-depth look at each piece. And keep asking yourself questions about each piece. A simple WHO, WHAT, WHERE, WHEN, WHY, HOW may seem simple, but it just might unlock a few ideas to write about.
Hope that's helpful. Good luck!