I don't know the answer, but I believe you should provide more information. Perhaps you can provide factors like their structure / shelter, its' size and the run or pasture. What is your intent with the geese? This may help people answer your question. Specifics.
I say this because I just got two 2 y/o Pilgrim geese (M&F) from a fella because they were too loud for him. Well when I picked them up they were living in a dark, dirty, moist and small enclosure. I'm not a goose, but it didn't look great. Now they are in a 40'x60' run and haven't made a peep. Now I'm looking to find out how I can let them run free around the yard while not leaving the property. I guess I'll keep them locked up for a few days then free willy and see what happens.
If I had to guess, you can probably just add them. I would add two females only though from what I've read before. I guess you could add a different breeding pair though too. Geese read to be quite docile for the most part. Good luck!
