Well, to be fair, in a sense, it's not.
Architecturally, all the physical parts are identical (assuming this is a 10-chip board as we've been led to believe)
However, the one difference is that there's a reason these chips were not put onto GTX470 cards, and that's because NV (or whoever decides) weren't 100% confident that 448 shaders would always reliably work on these chips.
Thus, I'd say there's at least some possibility that some of these cards won't OC like a 'real' 470, or even that some will simply crash once the unlocking is done whenever stress is put on the gpu by running a 3d app.
I see what you are saying, but these have been deemed gtx470 chips as they have the gf100-275 core and not the 465 gf100-030 core.
I would unequivocally agree with you IF these were gf100-030 cores that we were unlocking to 470's, but we aren't. We are just unlocking the rest of the soft-locked GF100-275's.