jungle have more similiar beat,dubstep have more similiar sounds,production technique ( sorry I am Bassline Smith maniac
) and alot bigger support from djs and producers.Its just my opinion,everyone can see it differently but at the end of the day dubstep is whats being played by dnb djs... not jungle or breakbeat even when these two have clearly alot more similiar beat structure.I know,around year 1996 dnb was born from jungle,but thats 14 years back,now its 2010,things changed alot after dubstep was invented
http://www.youtube.com/watch?v=L-GW3G3Pvd0