Same maximal hue difference: purple and its complement, yellow-green.

Same maximal luminosity difference: very light yellow-green and dark purple.

And same medial intensity difference, but in this variation: the light yellow-green has a lot of white added to the 'primary' yellow-green of the first variation making it extra light and moderating its intensity. And the purple is made without black which leaves it still dark but makes it high-intensity (therefore a medial intensity relationship).

William Tapley
Art of Color
Color Descriptions of
Sets   Paintings