According to the rules in the overview:
"The main condition is to create a game that uses any two colors."
"5 - if there are only two colors in the game(black and white or their analogues), 4-if there are three colors in the game, 3 - four colors, 2-five colors, 1-more than five colors. (The same color with different alpha channels is not considered separate colors.)"
So you should be good to use those shades, or even hot pink and slime green if you wanted, just as long as you stick to 2 colours!