im a socal resident who got into cal but not ucla. but i think in general my school had more ucla admits than cal. i doubt there would be statistics on that though because they tend to separate by state, not area within the state.
I'm from SoCal and it seems like in recent years Berkeley has admitted more from my school than UCLA. A friend of mine theorized that Cal wants more SoCal residents and UCLA wants more NorCal residents to have a more "diverse" class. I'm not sure how if this is true but it seems somewhat logical. Last year my school had 20+ Berkeley admits, and a mere 4 or 5 UCLA admits.
My graduating socal high school class was the opposite last year. Berkeley admitted 18 while UCLA admitted 24. The accepted UCLA kids had an average GPA of 4.2039 while those who were accepted by Berkeley had an average GPA of 4.1493. It seems like UCLA is more GPA oriented at least in this case.