Always try and provide a file even with 10 lines (fictitious if sensitive) and the exact data structure that you are working with, makes things so much quicker in terms of response time and often you get the solution sent back to you in the file.
Having 2 separate tables would seem to be the easiest solution. Pull both in as staging tables (load disabled) and merge queries either a left outer or right out will do it based on the dimension common to both tables. Then do a merge column (not merge query) to get it into the format above.
If that is a little confusing then consider sending a file and will send it back with the above included