If you count the new South Carolina made rifles there are actually 5 different versions.
There are pre-64's which used controlled round feed actions, (CRF). The stocks and a few other parts will not interchange with newer rifles.
The pushfeed rifles ,(PF) came out in 1964 and stocks etc. are all the same on all PF rifles with floorplates made up until the New Haven factory closed in 2006. There were a few PF rifles made with blind magazines during this time that would use different stock. All of these guns with floorplates had a 2 piece bottom metal and trigger guard. Your rifle is most likely this one.
In 1994 the Winchester Classics were introduced and made until the New Haven factoy was closed in 2006. They brought back CRF actions. The actions are very similar to the pre-64's. but stocks will not interchange. The first guns used the same 2 piece bottom metal as the less expensive PF versions. Some rifles near the end of production changed over to a much better 1 piece bottom metal.
The Controlled Round Push Feed's, (CRPF) were quite rare. The 243, 223 WSSM rounds would not feed reliably through the CRF actions. These 2 rounds, which failed and were only produced for a short time, were used in a modified CRF action.
Winchester closed the doors in 2006 and no guns were made until FN resumed production in 2008-present. The new FN made Winchesters are basically the Classic rifle, but with a re-designed trigger and all have the newer 1 piece floorplate and triggerguard.
If buying an aftermarket stock you need to know for sure exacty which action and floorplate/triggerguard you have. You can order new bottom metal, but it can get expensive, and it is also possible to modify a stock to work with the other type, but it is best to get the right stock.
The older PF rifles like your's is a good buy. You got a lot of gun for the money. I "prefer" the CRF actions, but that is prmarily just a preference. I have a couple of PF's and they shoot very well. A great place to start if you want to put together a semi-custom rifle.