Depends on Which Mock and which CAT you are talking about ???
CL MOCK 6 was easier than most of the recent CATs ...On the contrary, Mock 8 was not so...So, you know, it's better if you be more specific... :P :P Again, Mock 9 was also on a bid easier side, if not exactly same !!!
This is my analysis...! Purely opinionated !!
Others may differ while comparing the difficulty of the same mocks i mentioned.