Also wondering if there is any mention about having both expansions, do you use a total of 6 expansion boards and stables, or just stick with 5?
Take a look at this link from Lookout Spiele: http://lookout-spiele.de/2013/07/15/noch-mehr-stalle-fur-das...
Here is what Google Translate told me:
You want more action possibilities in Agricola 2's game "Farmers and Small"? Uwe was industrious, and test its players also. Again, there are 27 new buildings with interesting interactions - for example, the accounts office, the 4 wood, 3 stone and 2 reed costs, minus 3 points and brings you this for the rest of the game a 4 Work-ers are. Or the cattle market where you can trade anytime reed against any animal. Or Hofzimmerei with which you also can obstruct the same boundary parts that are new to get. 27 buildings, which again provide all the game a new trick (Plus a Stallgebäube and a courtyard extension, so you can even play this extension, if you do not have the first expansion.).
It looks like you'll stick with 5 expansion boards and stables, even if you got both expansions.