It’s not “necessary” to use your term, but there are differences. They are intertwined so it is hard so treat the factors independently.
At a college that sends a lot of kids to UC the counselors tend to be more familiar with the rules, with strategies should you run into a difficulty, they may be regulars at the UC conferences for advisors so they have someone they know personally they can call with questions, etc. Peer effects play a role too. When a sizeable number of the kids around you are intending on transferring to UC you have friends to study with, you can learn about opportunities or rules that they heard about rather than having to find everything out yourself, it is easier to avoid being pulled down by lower-performing and unmotivated students.
However any CC offers the classes you need to transfer and if the class is in ASSIST it will transfer.