AI flightplans question

Hello.I have downloaded some flightplans for the UK and Canada and have a question about the airport text files that are included.it says that you copy and paste their airport text to replace the fs2k2 airport text.a lot of the airports are already on the fs2k2 airport text but one or 2 numbers are different.Is there errors on the fs2k2 text that need replaced??
i can see adding airports that are not on fs2k but not replaceing existing entries.I am just curious and dont want to mess up the fs2k2 airport text.can someone explain this to me.thanks for any help that you can offer.............
i can see adding airports that are not on fs2k but not replaceing existing entries.I am just curious and dont want to mess up the fs2k2 airport text.can someone explain this to me.thanks for any help that you can offer.............