The game disc content was the same but it had a bonus making of disc which goty didn't have. Technically you are correct though.
But it goes back to what I said: PS3 TES games are lucky to have DLC bahahaha
The difference between Oblivion goty and Fallout 3 basic release dates isn't much really. Both are pre trophy rules.
Spoiler warning:
Maybe Fallout 3 was easier to patch them into? Who gives a toss, we're lucky that every game has them now.
There are a lot of early PS3 games that just never got trophies patched in sadly. Even worse are the ones with no rumble support. 360 or bust for early multiplats methinks.