They're all made at the same plant.
But, there are slight differences in them, not enough to matter really. The biggest thing is getting fresh ones. Alks lose juice over time, usually a few years into their life when they actually get to the stores they're down to 60-70%. If you get nice fresh ones (the ones with a date 10 years out) then you're good to go.
FYI Radioshack had a great deal on huge packs of batteries, something like $.15/battery, which rivals most other brands, but theirs are way fresher and tend to last longer.