Greg,
this is a fairly common cause of confusion. Anschutz have continually updated their stock designs, but have only changed the model numbers three times (and one of those was retrospective). So two stocks that are nominally the same but were made a few years apart, can look very different. This is true of all models to a greater or lesser degree. This is mostly confined to Anschutz rifles, partly because they are so common, but also because barrels and stocks are largely interchangeable (excepting the lightweight Match 64, and the square-actioned 20-series rifles).
The differences can be used to date rifles and stocks.
The original stock for your barrel looked broadly similar to the one it's in now: thumbhole grip, hookbutt. However that's as far as it goes. The original stock had a fixed cheekpiece, yours is adjustable (a feature added around 1971/72). The original stock was adjustable for butt length, and butt height, yours can also be moved sideways, and canted. The original had one-piece hook/butt, on yours the hook is separate and can be rotated (excluding the alteration). The orginal had a chequered grip, yours is stippled. I could go on further about the shape of the grip and fore-end.