Related, but having identifiable differences ThinkingOutLoud.DonaldNoyes.20140223
First some generalizations:
The first being employed in an individual's environment as a means of self-expression and elaboration, the second as employed by a cadre of individuals, formalized and standardized for group use.
Often used in criticisms, when words used in the language appear in the general collective of expressions. Noted as not very useful because of the lack of clarity as to what the language's words mean in this, a foreign context.