Unassigned AP credit is not considered equivalent to a specific UCLA course, though (at least in theory) a department can accept it in place of a requirement for the major.
However, it seems difficult to find any mention of AP credit on UCLA psychology pages like https://www.psych.ucla.edu/undergraduate/undergraduate-student-services/majors-minors/psychology-major-for-transfer-students .
Contact the department directly to see if the notations about AP credit in the ASSIST pages are still valid.