Yep, I think it's the exact same one because there is a 3.3V regulator below the chip on mine too. Although I haven't completely verified that all the pins go directly to the Sil3112, it looks like they do and you said the same, so I'll probably just hack a board and try it out.

I do have to admit, R25 and R24 look suspiciously like supply voltage selection pads for the flash chip...I'm going to investigate them further. I'm wondering if maybe R25 populated with a 0-ohm resistor (as it is now) gives 5V, and R24 might give 3.3V. I'm going to trace it out later when I have some time, and I might be completely full of it, but it's an interesting thought anyway...