ted, these are very nice bricks of wax!
sometimes i will get a color difference in cappings wax when melted down in my solar unit. much like honey, it's just the floral properties of the plant the bees visit. for example, clover honey is lighter than buckwheat or goldenrod, and the cappings wax harvested from these will also vary in color, clover= lighter, buckwheat, goldenrod, darker.
if wax is not properly filtered, any pollen, dirt or honey will also contribute to the color. i don't see this in your pix, this wax looks very clean!
i have bleached wax using a solar method, the longer left in, the lighter the color, this would be wax i had already filtered clean, then placed back in a container to sit in direct sunlight to achieve a lighter color.