Well, when dealing with old trucks, the body styling tends to carry over more than the cars did. With cars, back then annual changes were expected on cars, not like today where they all look the same and you can't tell one brand from another, let alone the year. Now trucks (panels/'Burbs included) got away with less changes, as they were intended for work, styling was secondary. So in the case of your '65, the body is the same other than some minor trim (the side badge location and shape) from '64-'66.
Hope this clears things up for you.
