New York and California emissions

I just received the build sheet on my new to me '94 Cherokee Country edition and the emissions specs have me confused. It lists both New York and California emissions. Is this common? The Jeep will be living out it's (and probably my) Golden Years in Cincinnati. I plan to put it out to pasture every chance I get while keeping it street legal. My question is, do I need to keep it California clean to keep it running well or can I remove anything to get better mileage/performance? BTW, Cincinnati did away with the e-check a few years ago.