I have to keep my geese in a different coop during nighttime too, during the day they range together with no problems, I used to pen them up together at night, but then my gander ripped off a call ducks back feathers. Keeping them penned up at night with ducks is a pain especially during the...
I wouldn't recommend keeping ducks and geese in the same pen/coop, geese in springtime can wreak havoc. Most geese are going to be loud, especially ganders.