Yes, they are made by different companies.
Goex is made in the US, and is the last US made BP. It's a good consistent powder.
Graf's powder is bought in bulk from Schuetzen which is made in Europe. Then put in Graf's bottles. It's different in that the charcoal is made from Alder wood. The same as Swiss powder. It's not in the same class as Swiss though. Swiss is the best BP you can buy right now, but you pay for it.
The Alder charcoal is suppose to make a cleaner burning powder. It does in Swiss, but I see no difference between Graf's/Schuetzen and Goex. Graf's and Goex have similar power. Swiss is the same power as T7.