It's a piece of cake. I do this to combine several different mods myself. Simply use a program that lets you open and compare multiple documents. I use WinMerge
(
http://winmerge.org/ ).
Use Winmerge to open the menu_1024_768.ini file from each mod that you are combining. Winmerge will highlight any differences between the two files. You can right click on each difference and copy it across to the other document. Save it and you now have a menu_1024_768.ini file that has the changes from both mods.
Regards,
Chris