I purchased some paint and tried to match the red on a 1998 CBR 600. The paint match was good but my painting wasn't. The problem with aersol cans is you can't control the flow of the paint. I was trying to paint and match a factory paint job. I was way out of my league with the cans. This was a job for a professional with a spray gun.
It sounds like you are painting a whole piece of plastic in one shot. Since your not trying to lay down paint side by side I believe you'll be OK. The colors you receive will be a very good match to factory.