You can transfer within the same college or between colleges.
There is generally no special requirement for changing majors. Some transfer institutions will have some qualifications for preliminary examination, that is, limit the number of transfer students to no more than 20%, while others do not have such restrictions.
Changing majors requires understanding the professional knowledge of related majors. When you transfer to an institution, there will be an exam to assess the basic knowledge, and there will be an interview to ask you about your understanding of the major.
That's about it!