@ucbalumnus from the UCD link, “Guaranteed spaces are located in Student Housing Apartments (SHA) and, as space allows, the residence halls.” I emailed the housing for ucd and said transfers room into apartments as residence hall is for frosh. I guess there’s still a chance to dorm if space allows?
As for UCI, it appears that transfers only get apartments.
I will surely ask each UC about it. Thanks for the information though!