They will expect a bit of overlap, but there are subtle differences between the questions
Reasons for applying - Well, your reasons for applying! Why LLM? Why Cambridge? What do you hope to gain?
Statement of interest - What intrigues you about LLM? What is your speciality? any particular path of going down? Future career plans? (I think this might be more for PhD students, but they are looking for what you are interested in and why you are interested in it)