When using any of the magical correspondences, such as candle colors, what is most important is how that correspondence resonates with you. As an example, a green candle might typically be used for a prosperity spell, but perhaps for you a yellow candle to represent gold might work better. And of course a white candle can always be substituted for another color.
So if you think a different color might be more effective, then it probably will be as it is in alignment with your thoughts. I would say go ahead and use the color that feels right to you. I doubt it would have any sort of negative effect on your spell if you do it that way.