Why are there two types of slide stop lever springs?

The original P99 slide stop lever spring is relatively short with an outward protruding curl at the rear. Premature slide lock in the .40 Auto P99s prompted Walther to change to the same slide stop lever spring that Smith & Wesson is using, which is longer, follows the contour of the slide stop lever, and has an inward protruding bend at its rear. Interestingly, with the latest .40 Auto magazine, Walther could go back to using the original spring. The 9mm P99s are still using the original slide stop lever spring. Below are photos of the two types of slide stop lever springs:

 

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