This is my debate as well and this still hasn't been answered. I may just call Flow directly tomorrow...
Wired do you know if on the 2013 you can use either power strap and then swap on a toe cap version as long as both are from 2013 models???
if both are 2013 NX2models, you can swap straps at will
if you want to swap straps from an older (NXT) model onto the 2013, it's not possible due to use of different ladderstraps and ratchets/buckles configuration
GorgeDad, your comparison 012-NXT > 013-NX2 matchup is correct
AT > AT (allmountain)
ATSE > SE (allmountain-freestyle)
FRX > RS (responsive, allmountian freeride)
FSE > GT (luxury sport, allmountain)
and there is a women's version of the AT too: Prima (allmountain)
weight is close to the same, depending per model