Google “name of medical school + medicine + class profile”
You will find some information, particularly about stats, but only UCI and UCSD list the undergrad attended.
https://www.meded.uci.edu/admissions/first-year-profile.asp
For both med schools, UCLA is their biggest undergrad feeder.
Except for UCR SOM, none of the CA public med schools offer any strong instate preference in admissions.