I'm by no means an expert, or even vaguely knowledgable :), but i would assume you can just use the old cable, if it's just the actual LCD itself that is damaged and the cable seems fine.

Great guide, i thought it was going to be tricky, but following this made it easy! I was actually replacing the display rear panel and the glass - my LCD was fine - so i had to improvise slightly taking hinges etc from damaged panel, but this guide made everything seem pretty straightforward, thanks guys!