Not that the picture resizing isn't a factor, but are they all the same dimensions? If so, I'd simply bend the tips and tails and compare them if you have possesion of them. If they feel the same they probably are. If not, you have absolute proof that they are at least two different models.
My dad had a pair of Millers circa 1971 or 72 that he purchased through the National Ski Patrol. As I recall, those skis had a metal top sheet and were solid red tip to tail other than where they were engraved. He really liked those skis. We also had some poles from Miller. The first ones I saw with strapless grips. Very light and well balanced.