If you are referring to databases such as the court records or the police national computer then they will be linked when they are put on. I once had a client who tried both constantly changing his name and spelling it very differently as in Robbart/ Robet etc. It was a pointless exercise the result of which is he has several linked records on court records. The number plate is a separate issue though (it is a unique number specific to that car) as if that is wrong on paperwork unless they have separate evidence (photographic evidence for example) then once the witness states the number plate in court it is that car and not your car you are talking about. If they realise what they have done before they state it in court then they can change it, but without further proof you or your legal advisor can challenge it quite successfully.
Just to be vey clear and transparent, this information is widely available to those who are not in the legal profession and I am not telling you anything you could not (and most likely have) found out for yourself.