Self-construal in itself is a term used to explain the definition one gives to himself or herself in comparison to others
with respect to social and organizational roles, as well as the basis for such definition. Most often, the ground for such definition is the perceived cultural differences in the self.
In other words self-construal is an assessment of the degree of one's independence or interdependence with others
It's different because in a information text main idea there isn't any opinion on it just straight up facts but with persuasive it includes how you feel on the topic/situation...etc. To sum it up Persuasive deals with your personal feelings and Informational doesn't.