diagnostic technique vs diagnostic procedure

diagnostic technique and diagnostic procedure both are nouns.

Word	Noun	Adjective	Verb	Adverb
diagnostic technique	Yes	No	No	No
diagnostic procedure	Yes	No	No	No

As nouns, diagnostic technique and diagnostic procedure are synonyms defined as:

diagnostic technique and diagnostic procedure: a procedure followed in making a medical diagnosis

diagnostic technique (noun)	diagnostic procedure (noun)
a procedure followed in making a medical diagnosis	a procedure followed in making a medical diagnosis