That could possibly affect their color but probably only on day old but they will probably be hard to distinguish when full grown. Recessive whites that are good quality are grey/gray(sorry I have white Orps and they should be grey/gray in my opinion, Ameraucanas are generally white/cream/yellow color depends on your eye reception) when day old so there may be some effect to the down color. I would never use white Amerauancas because the one that I had threw me Dun color and black with leakage on the cockerels when she was bred to a black rooster. If you have a white that was bred back and forth to blacks you will not have any problems generally but there are exception to some rules since you are dealing with recessive genes. Do whatever works for you that is the fun of the hobby.