The answer that @hasan-daghash provided works in most cases. I have a case where I have two charts, one with two paths (colors x+y) and another with a single path (color x).

User can toggle the second path on/off of the first chart. When toggled on, the markers on sole path of the second chart switch color to y.

The svg source still shows that the circle within the marker has still fill color x. I have no idea why this happens. Any help is appreciated.