Reconciling and merging 2 tables with almost identical 1st two columns?

Hi,

I have 2 Excel tables with information about a datamodel. (Excel 2003, by the way)
The sheets have almost the same 1st two columns: data table name and data column name, and then different columns for different information.
Table #1 with 2 extra columns indicating foreign key and comment and table #2 with 2 extra columns indicating data type and data lenght.
Most rows (identified by data table name and data column name) are in both tables; however some rows are only in one table.
I want to reconcile and merge those 2 tables into a single sheet with
- all 8 columns and with one single row when a match can be found between table #1 and table #2 (based on identical data table name and data column name)
- and, in between, the rows from either tables, which haven't found a match in the other table
- all the while keeping the order by (first data table name and second data column name), which both tables already have.

I hope I wasn't too complicated in my explanations ;-)
Can anyone help me? Thx a lot!