'Pink Perfection' is not an oriental but a trumpet lily - actually an Aurelian hybrid trumpet lily. There is a great deal of color variation with this particular lily grouping (Division 6) and those sold today are more correctly sold as the 'Pink Perfection Group' and colors range anywhere from a very pale, almost blush pink to a deep purplish-red.

If your other lilies are also Aurelian hybrids rather than orientals that could account for their color variability as well.

You are right. My mistake. And yes, the ones that vary in color are the trumpet lilies. Thanks.