[Docere]

The main differences seem to be that 416 was pretty much built up by 1970, while 905 is mostly post-1980 suburbia. And significantly more apartments compared to detached houses compared to outer Toronto.

Of course they blend into each other too. The far eastern edge of Scarborough feels very much like Durham Region, older parts of Mississauga very much feel like Etobicoke, and the Markham side of Thornhill feels very much like a continuation of Bayview/Leslie corridor of North York. However Vaughan feels rather different than bordering parts of Toronto, probably because Vaughan was pretty much farmland until the 1980s and is a generation behind in terms of construction (plus NW Toronto is quite poor and Vaughan is fairly affluent).