Is not doing the extra Cambridge personal statement disadvantageous?

I am applying to study law at Cambridge and am also applying to this at all my other unis. As a result, I don't need to use the Cambridge extra personal statement to talk about a different subject which I am applying to study at Cambridge. I do have specific reasons for wanting to study at Cambridge (related to specific modules they offer, e.g. Legal History), however I have already mentioned lots of my supercurriculars related to this. I also don't want my personal statement to be too history heavy as that's not the course I am applying for. Therefore, I am wondering if anyone knows if not writing this will be disadvantageous for my application (as opposed to other students who might mention specific reasons for applying to Cambridge).