The BCC Color Match filter simplifies the process of matching the color or luma values of two clips in the timeline. For instance, if two clips with different lighting conditions are spliced together, the color and luma values will differ between the clips. Match Color automates the process of removing or balancing the difference between the two clips by setting color or luma values for the quarter, mid and three-quarter areas of the image.
Ideally, you want to view both the Source and Target clips so that you can sample colors.
The built in PixelChooser, with integrated mocha planar tracking allows for greater control over which areas of the image the filter should affect.