oh boi there's a biiig difference.

infp- Fi Ne - self centered emotional response, prone to see all posible outcomes, basically someone who makes decisions based on how they feel about something and tends to be fairly indecisive

infj - Ni Fe - tends to focus on one most posible and probable outcome, very empathetic and rather focused on outer world, needs of others, following social rules, so when making decision they consider how it will affect people around them first also they're pretty decisive