I have an Embden gander and a Toulouse goose, gander 11 yrs old goose 6 and they are very happily married. Yes 2 different breeds can live very happy together.
I love love love my African Geese. We have a huge bond. They are so awesome and lovey with my kids as well, but can be a bit protective/possessive when "strangers" are around. (human or animal)
I love my boys too though my Chinese boy is much more social and friendly than my African. Lollipop loves pretty much everyone and has to be in the middle of everything. Sunshine likes to stand back and observe or Chase away strangers.