It is not 'converted'. The second game has existed since 2011, the original release date. It is just thus:

• If you live in Eastern Europe, Steam has always sold you appID 22490. Around a year and a half ago it was renamed 'New Vegas RU', it simply existed as a second 'New Vegas' up until that point. So, it was not a conversion, just a renaming to avoid confusing the two.
• If you live anywhere else, you get the global appID 22380. This is the game you are giving away, since all stores outside Russia have keys for that.

Thing is, these separate games have no region lock whatsoever. It is the store page that does a redirection for Eastern Europeans, so we cannot see the global version's store page and the world cannot see ours. However, you can own both, meaning you'd literally see two New Vegas entries in your library, with separate achievement and play time tracking. But this confuses the client to no ends and renders you unable to play the game (Steam goes into a recursive infinite loop trying to launch either).

This also means that owners of appID 22490 will not get a hit here as owning the game (since technically they do not own THIS game). So, you really need to check the winner because there is a good chance they will already own a New Vegas, just not this New Vegas.

+1

Yes, steam simply adds the DLC to your account when you activate the goty/ultimate edition of a game. The question is, are you ok with this? =)