When coparing two books, some people would normally think of the hight, the width, and how many pages there are. <em>That doesnt mean you shouldnt mention that.</em> But what you really want to look for is how the characters may act the same in some ways. How the themes are similar, and what the two topics have in common. Sometimes the settings are alike depending on the genre of the book.
If the person works for a national energy company there is high chance that the person would be a bit biased towards installing the new systems. This should definitely be checked.
