You would have to ask ohlins, or someone more knowledgeable about that.
As far as I know, they are completely different part numbers, as the 13 already has the scu for the damper. Ohlins offers a "race" scu as an upgrade to the 13s to make the damper more aggressive, and they offer a EC shock specifically for those years of gen4. Beyond that, I have no idea if it's simply an SCU change or something internal on the shock. Perhaps someone more knowledgeable on ohlins products, like LDH, might be able to chime
in here?
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