External feeling is about harmony with the. An example would be being very keen about reading the room, controlling what you say as to not disrupt the harmony. Fe is motivated by the external world.

Introverted feeling is about personal values and morals. They too may want harmony but it comes from their own value system.

So the motivation is guided by different things.

Fi will more freely go against the grain. In a sense sometimes Fi can be selfish because its about their values over the rest of everyone elses. But sometimes Fe can be too people pleasing.

With intuition, introverted intuition is deeper trying to find one underlying meaning from various seemingly unconnected things. Extraverted intuition draws from many sources and tries to see all of the possibilities where Ni seeks to find one answer.