Same seeds different type of container, very different shades of pinks??

I planted impatiens inside in April, then I re potted to various containers(one tin one ceramic). the same seeds are flowering very different shades of pink in the different containers. The tin has a few separate plants growing with dull light pink flowers and the ceramic has a few separate plants growing with bright vibrant pink. Both were watered the same and used same potting soil? Does anyone know why this happens

Same seeds different type of container, very different shades of pinks??
Acidity and Alkiline of the soil.


Hydrangeas are another example of this.