I believe any group that uses Greek letters are greek, however I dont consider professional or groups such as yours to the "same" type i guess.
Are you a secret society, i mean do you hold ritual that only initiated members see? If so it sounds more like your org is turning into or is a "social" GLO you just arent labeling it as such. Then I would say yes.
If not then I just dont think it is the same. But that is just my opinion and I think those orgs are good to have.
But yes I do consider you Greek.
