The trike builder I used for my conversion would get the CSC bodies in primer only and then have a local shop color match for the bike. Prior to the conversion, he asked me to send a side panel beforehand so he could have the body painted before I arrived for the work. I asked if I could just send the gas door as I was going to be riding the bike down and didn't want either side exposed during the trip. He allowed me to do that. Problem with that was that because the gas door is almost always facing the sun, it was one of the more faded pieces on the bike.
The paint job did closely match the gas door but didn't match up with the majority of the rest of the bike. It ended up needing an immediate touch up. Not sure how he got it done but he did. It still was slightly off but blended much better afterwards. He did tell me his painter explained that orange colors are probably one of the most difficult to color match. He also said that gray primer doesn't work well and had to use a black primer before putting the color coat on.
And afterwards, I didn't think about it but had someone mention it to me, the gas door still could have been better used for the color match. Even though the top part was sun faded, the gas doors are fully painted and he could have easily flipped it over and color matched to that instead.