There can be a fair amount of variation in the black - some are warmer, some are cooler. But I think the bigger problem area is going to be the white. There's snow white... and milk white... and they are quite different.
I would recommend that you get all of the fabrics that are mostly-white from not only the same manufacturer, but the same collection if possible. Those fabrics that are quite mixed-up in terms of the amount of black and white, you won't have to be quite as careful about matching.