Yes, I got a california pass (which comes at a discount) and paid for the express. You can even upgrade in the park itself, not just at the entrance.
I took this from their website I assume it includes the California pass; Upgrades are available for all fully paid Annual Passes. Upgrade your Annual Pass at any ticket booth or inside the park at the Universal Box Office. Tickets purchased with the monthly payment option, FlexPay™, cannot be upgraded at this time.
I'm sory. I don't know...
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