I actually know the UC will honor the lower AP score accepted by a CCC for Calc 1 because my brother had this very issue. (Berkeley required a 4, he had a 3 required by CCC, and Berkeley accepted it.) But he went further up the Calc ladder.
And according to the UC’s own matrix, Calc 2 validates Calc 1 “even if not taken.”
For peace of mind, he should check.