Is it possible to tell Welsh harlequin duck eggs from runner egg ?

[vtfarmer]

I bought both breeds this spring which I hope will start laying soon. Right now they are housed together and all free range all day but this winter I will be separating them for spring breeding. Until then I was wondering when they start laying if it is possible to tell the eggs apart ? Thanks in advance

 

[TLWR]

Depends. I have a fawn and white that lays white eggs. I can't tell hers the the WH apart. The ones that lay blue eggs, yep, I can tell those ones apart LOL