Is carbon copy of a cash-receipt equivalent to original?

(This is probably not the right place to ask but I could not find any appropriate place; so I start with an apology. Please clarify my following doubt.) A seller prepares the original copy as well as a carbon copy of cash/cheque receipt from buyer at the time of selling some item. He however hands over the carbon copy to the customer and retains the original with him. Are these two copies considered equivalent for all purposes? If the customer wants to lodge complain with the consumer court will the carbon copy of the receipt be accepted?