Actually, they should be in a similar ballpark. The Pandora will likely have a higher peak consumption (due to more of the OMAP cores being in use), but overall, the OMAP3 is in the same consumption range as the OMAP2 and most of the peripherals are very similar.

The only other factor is the Pandora's use-case, which is as an emulator machine. This, of course, means much higher consumption on average.