A question for Dragon Age: Origins Ultimate Edition owners on Steam

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Not sure, but looking in steamdb. UE is this package: https://steamdb.info/sub/6517/ and it contains 2 apps, 47810 (game) and 47815 (DLC). Your DA:O must be this https://steamdb.info/sub/2377/ and it contains 3 apps as you said. So, I guess if you install UE you'll get a second game rather an update from base to Ultimate Edition.

Disclaimer: I don't have Dragon Age.

You can own both games at the same time, they will show as two different games in your library.

if you can refund, do it just to avoid wasting money on it.

btw, i have these licences on my account.
awakening DLC is a standalone application (still needs the base game to run), it's added to your library with another licence.

I don't think you can't ask for a refund of your original purchase of DA:O, because you can only ask for that in any purchase before 2 weeks have passed since the purchase and with less than 2 hours of gameplay: http://store.steampowered.com/steam_refunds/

About your keys, here's some info I found in how to use them. But as already told by others before, you can have both versions of DA:O in your Steam Library: http://steamcommunity.com/app/47810/discussions/0/558755529841447139/

Not really the answer to your question, but a little advice from someone who really loved DA:O: the ultimate edition content is worth it in my humble opinion.

It's an old game before Steam packages were introduced for the Complete/GOTY/Final/Ultimate/Deluxe/FinallyTheWholeFuckingGameIsHere editions. So yes, it will be a separate product in the library. If it had achievements, you could also redo them again.