They're the same meaning in many sides. I almost can't remember they have any difference. I hope I can help you, good luck ^_<

there are no diffirence both耳朵 and 耳, means ear. 耳 is simple font.

they are the same meaning ,but different usage.耳is simple and also the etyma,rarely used as a single word in conversation , except in literature, in daily life when you want to say ear, use 耳朵。

1. The hearing and balance of feeling organs (films "ears") : ~ back (bei). To hang. ~ rest fellow mill (mo). ~ acupuncture point. To cover the eyes. ~ this sense. 2. As the ears of things: wood ~. Silver ~. 3. As the ears respectively as both sides of the things: ~ room. Ding ~. 4. Hear: ~ to smell. ~ soft. ~ luck (until 60 years, hear to others, would know his subtle mean, after the mean person sixty years old). 5. Classical Chinese auxiliary, just, just: take it for granted ~. 6. Classical Chinese modal particles (roughly with "yi") : "and a strong man die, die for it that name to".