Well, I do think that at a very basic level, destreza may be similar to baguajian (in terms of moving out of the way and finding a new angle to attack), but the weapons are quite different (baguajian is thicker, longer, heavier, but not well-suited for blocking). Some unique movements in baguajian as well (not sure if destreza does the overturn-type movement); the large sword size also makes swinging the sword around more like swinging yourself around the sword.
However, what I know is very limited right now - mebbe ask me a few years later