That is a point in favor of GT, where you get one free change of major during frosh year:
http://admission.gatech.edu/change-major
If you are admitted to UCLA as engineering undeclared, you need to earn a 2.7 GPA to get free choice of major:
https://www.seasoasa.ucla.edu/faqs-undergraduate-students/#major-requirements-options
Otherwise, changing major within engineering or from outside of engineering at UCLA is highly competitive:
https://www.seasoasa.ucla.edu/change-of-major/