of import vs important

of import and important both are adjectives.

Word	Noun	Adjective	Verb	Adverb
of import	No	Yes	No	No
important	No	Yes	No	No

As adjectives, of import and important are synonyms defined as:

of import (adjective)	important (adjective)
of great significance or value	of great significance or value
	of extreme importance; vital to the resolution of a crisis
	important in effect or meaning
	having or suggesting a consciousness of high position
	having authority or ascendancy or influence