[BrutalFoX]

i managed to fix it with a addon which replaces l4d1 survivors with l4d2 survivors and since i had all of them in all campaigns and all of them have same l4d1 survivors names it replaces 4 of survivors with l4d1 names with l4d2 models and names and now each character have their own specific arm voice and name
thank u for your help and replies bro
and a special thanks to Lux who helped us both