Ireland, West Coast, Ducks. June 2021 (1 Viewer)

[Cormac]

Two ducks that I would like to ID.
Thanks in advance.

 

[Alexander Stöhr]

Both look like Mallards to me. I see what you mean, but a dark blue-grey bill, nearly blackish is ok for this species, where intogression from domestic forms changes colours and pattern even in wild birds. There are many examples here on birdforum.
A white speculum (then often as a broad white stripe/bar), bordered by black is quite often=regular present in moulting female-type birds in summer. Your second bird shows this well.
I cant see any hybrid influnce or another similar exotic Duck here, but I am far away from beeing an expert in this topic.