You aren't asking a question, so I really have no idea what, if anything, you want help with.
You arguing that a different car should have been ticketed isn't going to get you out of yours. Interestingly, if you had the other driver in court and the other driver testified that you were going the speed limit (based on comparing your being next to them, and they knowing that they were going the speed limit) you might have a good case.
Fight it with whatever information you have.
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Selective enforcement is only a defense if the basis for the selection is prohibited by public policy as with race, gender, religion, national origin, etc. When two robbers pull a bank heist, the law allows a cop who is present to pick either one of them to arrest and leave the other to subsequent efforts by other officers. The cop can toss a coin, pick the best looking one, or use any other non-prohibited basis for selection. In your case, the first suspect evidently passed the attitude test with flying colors. Or maybe that driver reminded him of someone he really likes. I was once cut loose by CHP because the dog in my passenger seat was so impressive. Go figure.
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Selective enforcement isn't going to be a useful defense here. It is obvious that you are frustrated. You are likely only going to wind up more frustrated if you try to fight this case yourself. I say this because of the thousands of people I've seen in court fighting their own ticket, maybe two have actually been successful.
Hire an experienced traffic attorney in San Jose. They may be able to get the charges reduced or dismissed.