It is my understanding that all the Langshans in the U.S. are the Croad type. The Modern Langshan and the German Langshan haven’t been imported here, that I’ve heard of.because Croad Langshans seem to be rare, in the US at least.
Ours are of course not Croad,
https://livestockconservancy.org/index.php/heritage/internal/langshan