I had a heck of a time finding matching paint for the used wheels my friend Jr. got from ebay for her '03 Hyundai...it was like some sort of classified data...I called Hyundai, they said I had to talk to the dealer, the dealers didn't know, although one referred me to their bodyshop which referred me to their paint supplier who said if I brought the wheel and left it there they could shoot it and mix up a quart of matching paint. I think I spent a whole day searching the internet, paint mfrs., etc, and couldn't come up with a color code. We wound up going to (chain) auto parts stores and trying to match up the bottles...I think I even carried a wheel into one of them. After 6 or 8 bottles I finally got one close enough but not perfect. What a fiasco. It would have been easier to send them off to Wheel Collision Center and get them repainted (they woudn't send me any touchup paint, either).
EDIT: Sorry for the rant, those Hyundai wheels were a very different color than the wheels on my Acura which are probably the same as your Honda. I think you're likely to have much better luck with the generic colors and/or people knowing what color will match.