Difference in difficulty level of questions between phone screen and onsites at Google?

I have an upcoming phone screen for L3 at Google(US region) and I am trying to structure my prep for it. Based on the recruiter email about available dates, max I can get is 10 days to prep if I selec

I have an upcoming phone screen for L3 at Google(US region) and I am trying to structure my prep for it. Based on the recruiter email about available dates, max I can get is 10 days to prep if I select the last possible date. So I am trying to figure out if revising only medium questions would be sufficient or is the difficulty level same as onsite where I have been seeing lots of people being asked hard questions?