Somebody correct me if I am wrong, but, I don't think the Air-Fuel ratio sensor has anything to do with emissions. It shouldn't matter if the Air-Fuel ratio sensor is "California compliant" or not. Any Air-Fuel ratio sensor that fits this particular vehicle should work just fine, as long as it's a DENSO.
My 2010 Toyota Camry XLE is also the "California version." About 6 months ago, I replaced both my AF Ratio Sensor and O2 sensor with the cheapest Denso sensors I could find that fit my vehicle and I have had absolutely no issues to report. Car runs fine and have gotten zero codes since.