No, I don't think there is enough difference between these two terms to talk about. Strictly speaking, growth occurs in fields where an organization or a country is already active. Development suggests new endeavors in areas where there are currently no operations.

sorry for a slip of keyboard, sustained here is a verb.

Besides what the fellow bellow said, which I think is helpful, I hope you could pay a little more attention to "sustainable", which is an adjective refers to a scientific way and capable of developing for a longer time, and to "sustained", which is a noun refers to maintain in this case and which the development concerned may likely be stopped by any means at any time. So the meaning of sustain needs more contexts. But of course if you're not writing paper or something like that, there's no need to be so fastidious. Hope it'll help.Wahaha.