Greg Black 4.5G-5G

[anatolewilson]

I currently own a GB 4.5G-5G Regular weight Trombone mouthpiece and I am interested on a GB New York 5,5 trombone mouthpiece. According to Greg Black's website both of these mouthpieces are similar with regards to the rim width and cup depth. Are there any other differences and how the New York Series compare to the Standard Greg Black series?