Can anyone tell me if there is a difference in the color of eggs laid by Black Australorps and those laid by a Lavender Orp? I have BAs both hen and roo, and am thinking of getting some lavs. The color is so beautiful! But I am wondering if I will know whose eggs are whose when it comes to picking hatching eggs for the future. I don't want to cross the two. Is there a marked difference in color? Thanks in advance, for any info.