"../path/file_A.txt"

ID;C1;C2;C3;C4
1;one;clown;funny;children
2;two;hero;truly;saga
3;three;monk;honest;perl

"../path/file_B.txt"

ID;CA;CB;CC;CD
1;one;baby;scream;teddy
2;two;mom;work;book
3;three;daddy;football;PC