Room of Requirement=Room of Hidden Things?

*revives*

Have spent most of the holidays rather comfortably in bed, drinking tea and re-reading DH (among other things...). But now, I have a problem...

I've always blithely assumed that the Room of Requirement (appearing when people need it) and the Room of Hidden Things (appearing when people need to hide something) was the same thing, giving each to each... Now, however, I'm not so sure any more, although I still think that Draco and the DA could have hid in the same room, hidden from each other.

If it's two different rooms, they fulfil a very similar function, but then only Draco's Room of Hidden Things would've been destroyed by Friendfyre...

I'm asking your opinion to find out how seriously I need to revise my recent hp_darkfest fic... Opinions?