As I understand it, while you can have multiple males sire babies within the same clutch, it is less common than 50/50 odds. Also as Dr. Del said, each egg has a chance of being fertilized by either male, but not by both and I don't believe it makes any difference which order the pairings are done.

One thing to consider as you do pairings, is it may not be wise to use both recessive and (dominant or co-dominant) males with the same female unless there are other genes present in the recessive that are unique to it. For example if you paired a Pastel Pied and an Enchi male to the same female, you could be assured that anything with Pastel present is het for Pied. Subsequently anything Enchi would not be het for Pied. However, any normal produced may or may not be a recessive and you have no way of knowing but to raise it up and breed, which could turn into a lot of time spent with no fruits for your labor. The other side is having to sell them all as normal even though they could be het, because you can't say with any certainty whether or not they are het since the co-dominant male could be the sire.

I hope that helps.