I bought a SS hood and spoiler, and was wondering how many people have had problems with red matching?

I recently had the entire car repainted (Like ~8 months ago) due to someone hitting me, i had it repainted the factory 81 GM bright red. I still have some of the paint that i used, its from a company called : Matrix, but i don't have enough to do the hood and the spoiler.

Also anyone have a idea about how much it would cost me to get both of these sanded and painted (There primed right now)

Thanks alot !!

 

The quote I've found around here in stl is $300.. probably $100-$150 for the spoiler.