Reform Boehm and German clarinet mouthpieces

Hi, I have a question, hopefully someone here can clear this up.
On the Wurlitzer website it says "The mouthpieces for German and Reform-Boehm clarinets are identical" but some other makers (such as Gleichweit) offer different reform Boehm and German drillings on their mouthpiece models. What's the difference? I know German mouthpieces do indeed fit reform clarinets. Are reform mouthpieces supposed to fit even better (and how)?
 
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