they have different names or something else?
Do you mean Printed Circuit Boards? If so, they have different isolating materials, different number of layers, different processing requirements etc. etc.
A question well stated is half answered.
"Distinguish" , or "Take derivative of" , or "Chemically separate" ??
pcb from http://acronyms.thefreedictionary.com/PCB
Perhaps you'll clarify what you meant.
Separate names with a comma.