Are these markings on the webs normal for mallards?

[Familiarrat]

This duckling has had small pink patches on their webs/toes since they hatched. Sibling doesn't have them. They aren't raw skin or anything, that's just the color

 

[New duck mommy 2021]

This duckling has had small pink patches on their webs/toes since they hatched. Sibling doesn't have them. They aren't raw skin or anything, that's just the color











View attachment 3122761

My khaki x Pekin babies have these
Khaki were made from mallard , runner and Rouen
Mine at 4 months still have them just much lighter now
It’s how I could tell them apart when they all hatched

 

[Familiarrat]

My khaki x Pekin babies have these
Khaki were made from mallard , runner and Rouen
Mine at 4 months still have them just much lighter now
It’s how I could tell them apart when they all hatched

These are 100% mallard from my understanding though-

 

[New duck mommy 2021]

These are 100% mallard from my understanding though

My Pekin and khaki don’t have markings on feet
But the babies did but only the drakes not any of the girls
The girls look more khaki / Rouen
But my boys look more mallard
So that’s why I thought maybe it’s the mallard gene
I wondered where my boys got the two tone feet from
Because khaki have mallard genes maybe it is the mallard
Here are my boys from the cross