If you listed something different on the UC application vs what you ended up taking, you are required to notify all schools about the schedule change. Your transcript needs to match what you listed in the application. For the schools where you have been admitted, you need to email them the changes or there is a risk for losing the acceptances.
UCLA’s website does state for an appeal: additional coursework or information that clearly shows the student to be stronger than had been earlier evidenced.
Regardless if you appeal or not, you still need to notify all the schools of the schedule change.