Is there a difference between a blister/cold sore and a canker sore?

Cold sore is herpes: Cold sores or fever blisters are caused by herpes simplex type i (hsv 1).

Cold vs Canker sore: A cold sore or fever blister typically occurs outside the mouth; around the lips, chin and just under the nose, and are caused by herpes simplex virus type 1. In the event that a cold sore occurs in the mouth, you'll see it on the gum or soft palate. Canker sores typically erupt inside the mouth; on the tongue, inner lip and lining of cheeks. Exact cause is unknown.