P: Ability to have a white balance type tool that can be loaded with any selected color.

Suppose an item of any given color appears in two images.  I'd like to "load" a dropper with that item from one image and click on it in the other making the color match exactly and have the rest of the image adjusted with the same hue changes that were used to match the item in question.  I'd like it to work just like the white balancing tool, but be able to choose the source color rather than being locked into grey.