I guess I'll take your comment to mean the stainless steel and the black mouthpiece have extremely similar qualities.
I don't know where to find a Hohner Perormance harmonica with the stainless steel surface mouthpiece. High end harmonicas are as scarce as goat wings and hen teeth.
I am in the huge metropolis of Houston, Texas. A local Guitar Center store is big, but I think the only chromatic harmonias they had were a 270 and a 280. I have no idea of how the public in the u.S. can see any other chromatic harmonicas.
Guitar Center had no Seydel, Suzuki, Easttop or other chromatic harmonicas