JBroll is right, even two Ts9 of the same kind could sound different, There are many factors such as inexact resistor's values, etc.
I remember reading somewhere that those old fuzz boxes sounded different even with a different 9v battery, so Hendrix went to the stores, tried them ALL and picked the one he liked.
Nowadays is much different, but like i said, there is some things u cannot control.
I just made an exact CLON of the od820 (i was the one that sent u the schemo jbroll), and it sounds fantastic, and even tho, i used better parts than the original, like metal films resistors and poliester capacitors, etc. Even the japanese arent puting the best shit arround.
And let me tell you something, this is supossed to be top secret but wtf. Maxon started to put worse parts on the ibanez manufacturing, so maxon would always sound better.. well nowadays they broke up relationships.
cya