J1 and J2 are the same colour. The key used for the slices is on the left of the image. The labels on top show more detail, but several haplogroups are grouped into the same colour.

For distinguishing between red and green hues for some people, http://colortest.it/enhance-r:http://brilliantmaps.com/the-g... might be useful (or the "Enhance green" setting, or switching between the two).