dd2 biggest discrepency, standard kicks are to defend your back, kinda like renegade for the NES.
the jumping spin kick from the first game (jump + kick) is replaced with more of a forward spinning heel kick, propels you forward.
running is now a factor, & like the NES version you can do the tornado levitating kick, if you time it @ the very apex of the jump, standing or running. dont think the hyper uppercuts from the nes port are there, i could be wrong though.
i did a standing knee strike. i have no idea how that happened, unless its like the uppercut or standing spin kick, from a stunned enemy combo, in dd1.
idk much about rosetta stone, other then it looks & plays like a hot mess.
you can run, pressing jump + punch & you do an inverted handstand on their heads, head butt them from above. rather bizarre.
running towards a downed enemy & pressing punch & you'll do a flying knee drop. run + punch normal = a flying clothesline. jump + kick = tornado levitate kick, like dd2.
the over the shoulder throw has been replaced by a final fight - like suplex, performed from behind though.
i agree some documentation would be nice but i dont blame gog so much as whoever rebooted & compiled these.