355 fobs

Hello guys this Q has probably been flogged to death but can someone advise that is there any internal visual difference that can be clearly seen if changing the fob battery that shows you have a master (red) and a general (black) fob. Or point me to the link that shows the difference. And can the pin be extracted from either the red or black fob? I have heard you can extract the pin from.ecu and or master from someone in Australia
I'm in Australia so the contact would be great.
Thanks in advance

 

Ok will do thanks for that