UCSC for CS vs UC Irvine Undeclared

I got into UCSC for CS and unfortunately UC Irvine as undeclared. Should I take the risk and go to Irvine, and try to switch into CS or a similar degree? Or is it basically guaranteed I won’t get the degree I want because of the competitiveness.

UCI change of major criteria for CS:

http://www.changeofmajor.uci.edu/CoM_ICS.html

Note that UCSC is within driving distance of lots of computer companies.

Do you know if it is hard to get these classes if you are an Undeclared major?