Original paint color value

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Question: How much value (if any) is lost in a collectible car if the original color paint is not used in the restoration? The car in question was originally painted with a special order (no paint code on cowl tag) paint sourced from another manufacturer. I know this from talking with the several previous owners, but I have no documentation to back it up. The car has been repainted once in the original color which I don't care for. I would like to re-paint it a color of my choice, but not at the expense of devaluing the car.

Thanks for any info,
Richard S.