Welcome to WebmasterWorld Guest from 220.127.116.11
Also, Overture uses their own proprietary canonical form of multiple word terms, with the most common word, usually listed first in the active search term:
You submit "blue widgets", but the term that goes active in the account is "widget blue"
Going the other way GAW -> Overture, you run into the problem that GAW limits you on description length (2 lines of 30 chars.), whereas Overture allows a lengthy description, though they rarely display the entire description in their major distribution channels.