Yes, doing duck and geese in the same bator, they both have the same humidity and time requirements. I bought a set of 10 eggs, got 12, and then bought 6 and got 8, so they will throw 2 in for luck lol. They hatch about 28-30 days, and up until day 25 should keep the humidity between 50 and 60%, then for hatch 70-80% I've read. The pekin and WH should be able to be in the same incubator. Check Sally's threads about checking the calibration on your hygrometer. Very helpful to know if your hygrometer is a few % off or not.
I googled your geese, they are beautiful. are these your first geese? if not what is their temperment like? do they eat a ton of food? I wouldnt mind a couple of geese someday. do you have pics yet? would love to see them.