I still am not entirely sure what Type of goose I have, though they are all obviously a (or possibly two different) chinese types. But I am pretty damn sure I have two ganders. I found this really informative site from the Australian government which I thought was hilarious - so I had to share
Table 2. Characteristics of the gander and goose
Gander //
Goose
A high shrill voice VS
A harsh, hoarse cry
Slightly larger body / Soft abdomen and wide pelvic bones in laying geese
Slightly longer neck
Larger head
Knob at base of top beak in Chinese geese
Moves to outside when flock is approached
Hahaha - High and shrill vs harsh and hoarse. SO TRUE
Full Link here - very comprehensive
http://www.dpi.nsw.gov.au/agriculture/livestock/poultry/species/geese-raising/egg-production
Edit: Damn it! Its impossible to format for tables!