you should be able to add the approprate lines from one 2da file to the other.
Use kotor_tool to open up both 2da files - find the lines you need to save (probably going to be at the bottom). Now, you have to copy each field seperatly (it won't copy a while line at a time - kind of crappy)
once you have your new lines from one 2da file pasted into the bottom of the other 2da file, then save in your override folder.
voila - you should have one 2da file with all the right stuff in it.
hope this was clear enough - if not, I can re-word for you later