Two different individuals. What mallard hybrid might this be?
Edited: Found out at gobirding.eu (http://www.gobirding.eu/Photos/DomesticDucks.php) that this is domesticated mallard. However I did not found out what the breed is called.
Edited: Look like the breed is called Abacot Ranger Streicher (http://www.zooenc.eu/en/abacot-ranger-streicher-duck/).