there is also a short action classic for cartridges such as the .308 and .243.
If I'm not mistaken, the .308/.243 Classic SA is the same as the 270WSM/7mmWSM/300WSM Classic action. Bolt face and extraactor aside, the difference is in the magazine box, follower and possible the ejector. The .243/.308 class SA has a filler piece in the back of the magazine, whereas the WSMs do not.
As mentioned, barrel contours will differ as well.