As far as I recall, Open Revolt as the name suggest is a reprogrammed engine. The only thing similar between this and that is that it seems that the open revolt packaged for Pandoras used the official graphics. I can't remember if it did a separate download the first time you ran it because it was iffy to package up the data with the engine, but if you take responsibility for getting it, it's freely available.
As i have the Open Revolt on my Pyra: Its downloaded the Data from the Remake, but also some Maps and Music from the Dreamcast Version,
Allthough it was not contained in the DBP..
But this is maybe to much for this Pandora Thread, the rest shall be discussed on a New Thread on the Pyra Part of the Board..