Insert missing column names

Hi, I have 1 main excel file which contains column names in specific order. Also I have a lot of other files which I need to change (at the moment by hand) so that they have same name order (just header not data). I have about 74 columns which are starting from row 2 . In row 1 is data that group those columns in logical units (grouping in meaning just merge cell above column names). In other files I have also some old and some new column names. Is it possible to compare and insert just column names ??
Thanks