The events are similar in that both involve the snake and the magician, although the roles are reversed. In the first event, the snake sees the magician and plans to attack him, while in the second event, the cat sees the snake and attacks it to protect the magician. Therefore, the correct answer is: Both animals are involved in both events, but in different roles.
Sidenote:
Good luck with the 19 assignments, that's a lot before the end of the school year.