Cone seat vs ball seat lug nuts, does it matter?

It matters a lot, because the seat must match your wheels or the clamp load is wrong. Cone (tapered, 60-degree) seats are standard on most aftermarket JDM wheels; ball (radius) seats are common on OEM Honda and some factory wheels; flat seats use a washer. Fit the wrong style and the nut won't center or hold, so the wheel can work loose. Always check the wheel's seat before buying lug nuts or locks.