Lets start by going over the difference between internal conflict and external conflict. Internal conflict is when refers to a character's internal struggle for example a character might struggle with an emotional problem such as fear of intimacy or even abandonment. On the other hand external conflict which is a struggle that takes place between the main character and some outside force for an example when the protagonist struggles against the antagonist. By using this knowledge we can now tell the difference.
Excerpt 1: Internal Conflict
Excerpt 2: External Conflict
Excerpt 3: Internal Conflict
Excerpt 4: Internal Conflict