I wonder if anyone can answer my question?

I just got my second i920 delivered about 2 minutes ago, and I checked the batch number, and it is identical to my chip I got yesterday..

I thought that the last three digits after the letter would be unique to each chip, but they are both 3921A624..

Is this normal??

I didn't think that you could get two chips with identical batch numbers like this, I thought it was only the first part that could be the same, like 3921A and then the last three numbers would be different for each chip...