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The term “California” emissions is a bit misleading as 13 states officially use the emission standards set by C.A.R.B. (California Air Resources Board) and 1/3 of new cars are sold in these states. The EPA adopted CARB standards starting in 2016 so as of today there is only one emission standard.
During emission testing the vehicle is run on a dyno in a specific pattern and the gases coming out of the exhaust pipe are collected and analyzed. Evaporative Emissions is a separated test. The vehicle is placed inside a box for 48 hours and no more than 2 grams of hydrocarbons can leak out of the vehicle.
To be certified by CARB the vehicle must past both tests so I have no idea why you would find parts labeled for one or the other. Especially not fuel injectors.
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