Why are these IB hens so different looking?

[AnnaLease]

They are 13 weeks old and they're both supposed to be IB, but they look so different! Any idea why?
The one on the left has a pretty solid green chest, but the other one has brown feathers with light colored lacing.

 

[barryk]

looks to be a male on the left and a hen on the right.

 

[Choctaw Valley Farm]

Could you post a better picture with more lighting?

Thanks

 

[AnnaLease]

Well, I'm pretty sure they're both hens. Let me go take some more pictures...

 

[Choctaw Valley Farm]

Sorry, it posted twice

 

[AnnaLease]

OK, I took some better pictures.

You can see that the one on the left has white on the back of its head, and the other one is dark.

Now that I look at them closely, I'm begining to wonder if the one on the right is a male...

But its back isn't very barred...?

The primaries aren't very orange...?
And one more picture of the one with drab chest feathers and a light colored head:

What do you think?

 

[zazouse]

I think ...
You have a pretty pair

 

[Choctaw Valley Farm]

It looks like a pair, but give it another month and post more pictures.

 

[Arbor]

Definately one male and one female - in original pic left is male right is female