They're different but not different enough, in FFXI the animations differed alot, and weren't just variations of the same thing. (Compare /sit for Hume, Elvaan vs Hyur, Elezen and Highlander).

Hell! I think jobs should have different stances instead of reusing the same battle stances that classes use, MNK's WS that was showed today was very Kung-Fu-ish, why not give him a matching martial arts stance and attacks to go with it?