
This post will cover the similarities and differences (in brief because one could easily write a whole book about it) in The Chronicles of Narnia and His Dark Materials. I will address themes and concepts presented in both series.
Alternate Worlds: Each series exists in a multiverse, one where an abundant (and seemingly limitless) number of worlds exist. This creates an interesting dynamic where the author can create alternate religions, or parallel religions as well as create imaginative creatures and narrative tools.
Children facing hard moral decisions: In both series, children (who are the protagonists in both series as well) are faced with hard decisions and don't really have parental figures (or at least good ones). In both series, the children have to make decisions adults would have to make and play adult roles. For example, Peter and Susan are high king and queen of Narnia and the other children have significant rescue missions that they go on. In His Dark Materials, Will serves as a guardian to his mother and ventures out to find his lost father by himself. He is also given the responsibility of the subtle knife, as Lyra is with the golden compass.
The North: In both series, the concept of "The North" definitely holds significance. In the world that Narnia exists in The North is where Narnia is and the south is where Carolmen is. In both series, the North seems to be where the majority of the magical and religious things occur. I am not sure why both authors choice this concept but it is common in both series.
Talking Animals: There are talking animals in all of the books, which seems like an obvious fantasy concept. In both series, however, not all the animals speak and there is some sort of virtue tied to animals that can speak. In Narnia, it is a crime to kill a talking animal-as they have the same sort of value a human would have, but it is typical and not a crime to kill a normal animal (ie hunting). This is the same in His Dark Materials, of course Daemons are not typical animals but other animals such as talking Mufelas discriminate between them (because they are surrounded by Dust) and the animals they hunt. Animals such as the armored polar bears are also differentiate from other, non-talking animals.
Age and Innocence: In both series, there is a definite connection between age and innocence/purity. In Narnia, there is a certain age at which the children become to old to ever return to Narnia. In His Dark Materials, age is also associated with purity. Lyra can no longer read the golden compass in the pure way that she could before when she reaches purity. Dust is also associated in a way with children that it is not associated with adults. A child's Daemon also settles after puberty.
Heaven, Hell and The Afterlife: The concept of the afterlife is present in both series, although presented differently. In Narnia, the children (excluding Susan) all go to Heaven after being killed in a train crash. Heaven isn't described explicitly in this scene (in The Last Battle), although it is implied that Heaven appears much like Narnia. A Hell isn't explicitly stated either in the Narnia series, although sinners are damned by being reverted to a non-talking animal state. In His Dark Materials, the afterlife is much more explicit, there is a Kingdom of Heaven as where The Authority lives, however this is an alternate world and not a place where most souls go after death. In Pullman's trilogy there is a World of the Dead, which Lyra and Will visit which is a place that all souls go to after death and is controlled by Harpies, a concept from Greek mythology. Lyra is able to make a deal with the Harpies and change how the afterlife functions, something that does not seem likely to ever happen in one of Lewis' books.




