Originally Posted by Klutch9
Here is the response from KYB, who responded very quickly FWIW:
Erik,
Since you verified the stamping is correct, there's no need to send additional pictures. The reason for these differences is because both struts were built in different KYB plants in Japan. The top nut and striker caps, even though they are different, it is purely visual. Functionality and installation is the same.
We try to stay as consistent as possible across our assembly plants, but sometimes due to plant location and tooling present in each plant, the components used are slightly different. They are, however, all built to the same level of quality and the designs have all passed our OEM level standards for durability and inspection. They will both work exactly the same when installed onto your vehicle.
Imagine what you can't see that are not matching. However, unless you are racing, the car's weight itself is not evenly distributed. It is going to be slightly off from the beginning to the end, and you should be ok.