Put an 08' Hood on my 06 GTS Blue Coupe with Silver Stripes and only painted the hood, no blending. The key is to match the paint to the front ground effects area (by the Viper logo) just below the hood and in bright sunlight. Most likely that is the majority of time you drive it anyway, or when I drive mine.
In sunlight, my hood looks just fine as with metallic paint and all the angles on the fenders, it is hard to tell as the metallic factory paint throws diffrent shades all by itself. In the shade or out of sunlight, you can tell it is slightly different. Of course, 99% of the people can not tell even when I point it out, but then again, I am anal.
In the end, it just comes down to your level of tolerance. I like the idea I can put the old hood back on and it will still match perfectly. 6 one way, 1/2 a dozen the other.
