Making changes to more than one file

[irvnriir]

Would be great addition to the package ability to write something to both the compared files, example: you comparing two files with same script which have some changes (for example values all over the file scaled) and want to update the script, enabling transition function and writing changes to one file, they getting transported to same place in second file. disabling the function and scaling written values in one file, update complete and no need to copy,paste each time in similar situation.
Also sorry for writing it here but anyone know is any package exist which would add the functionality ?