There are version differences, droid 2=2.2.0 and the r2d2=2.4.5 (I think), and I think (don't quote me) some bootloader changes they made. The sbf for the regular droid 2 won't work for the r2d2 and the roms are the same way (I think). It's best to wait for the r2d2 sbf to be released before anyone flashes roms or they could end up with a bricked r2d2 droid 2.
Sent from my DROID2 using XDA App
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