Different chart colors in Contributors page

WCAG 1.4.1 Use of Color requirements state:

1.4.1 Use of Color: Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. (Level A)

The charts on the Contributors page use different colors for overview and individual contributors, even though they all represent the number of commits. If there is no difference between them, they should use the same color, otherwise the difference has to be more clearly communicated.