2SC2021pin configuration

[*Star Project]

Hi!

Does anyone know the pin configuration of the
transistor 2SC 2021? By looking at the tb-303 
scheme's i guess it to be as shown in this .gif
picture.
http://members.tripod.com/atomictroop/DIY/2SC2021.gif
however just to be sure can someone dubbelcheck me.
And BC 547 is the right replacement transistor 
for it right? 
Whats the difference in using BC 547B or BC 547A anyway?

With regards 
/ Andreas H