how what?.. what kind of example do you need? there isn't anything new under the sun. go do the research, compare the two, and then try thinking for yourself.
the term "graffiti" is a fucking generalization and stereotype and embodies everything including turf writing, to the subway writing culture, to bathroom stall writing.
the subway writing culture, the aerosol writing culture, aerosol morphology or whatever the fuck you wish to call it embodies the act of racking: (confiscating paint with the justification that writing is an expression of freedom and communication; is a misunderstood artform; has a risk of being buffed, etc.) hitting: (tags; signatures), bombing: (hitting: tags, signatures, and throwups: (quickly painted pieces); and piecing: (burners, murals, productions, etc. ), has a HUGE gap between cholo turf old english lettering elaborations, and is more indepth in terms of the overall development and the style of ones tags and letters and expressing oneself than just territorial old english "Placas"...
and like CACashRefund posted.. Yes, "the colors duke! the colorsssssssss!" are also a big difference.
also I'd like to add that in terms of the philly+ny writing culture it involved all kinds of races from whites, blacks, asians, ricans, than the turf writing in L.A. that consisted of mexican-american or latino.