And the results of the "Which one is the Japanese Oreo" Survey are:
B: 8 votes
A: 1 vote
The answer: B.
Some people said there is some odd "tang" or taste that set the Japanese ones apart. To me, it tastes like the Japanese ones are missing something rather than having an odd flavor. In other words, they tasted more like a generic sandwich cookie to me. But it is interesting that there was a decided difference that most people could discern when tasted side-by-side.