Here is the thread with the summary of Regents scholarship amounts at each UC campus:
Note that UCB, UCD, UCLA, UCM, and UCSD have an award amount that may be increased if the student has need beyond the honorarium amount. UCSD limits the increased award to California residents, and UCM limits the amount of the increased award to in-state cost, but the others do not state any such limits, although UCD is more vague than UCB or UCLA about the amount of increased award.
Getting a Regents scholarship is much less likely than getting admission to the campus.