You would do better to stop there. It doesn't matter if individual precincts are the same or not. thre are obvious disparities between them. We have geographical segregation (as if you didn't know), so voting inequities in different precincts affect different populations. It doesn't differ from previous voter suppression methods in any significant manner. In fact, geographical separation makes unequal treatment easier. The important part is take the underlying goal of inequality from a previous age, and see how the same goal exists today, with different specific practices. You are quibbling about unimportant specifics, while ignoring the obvious underlying motivation.