Hi, I’m not sure about the diploma, but each college has a different set of requirements and classes you must complete. I would go here: http://admissions.ucsd.edu/colleges/about/index.html where it explains their college system and the different requirements each of the colleges have.
I’m a soc major at Berkeley, but when I was applying to transfer I was interested in Marshall or Roosevelt. I would stay clear from Revelle, I believe it’s mostly for science and engineering majors, but not exclusively. I would just read through the requirements and see what best matches up what you want to accomplish once you transfer.