laguna in dash multi cd changer?

I have a 53 plate laguna with standard radio/cd player, i have a renault 6 disc in dash muliti changer to fit but one source has told me it needs codeing and another that it cannot be used as they need to be a matched pair, even though they are standard renault, can anyone help. PS. I have not gone to the expense of buying the connecting lead just in case it cannot be used, just want to know first. Thanks