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https://www.milsurps.com/showthread.php?t=42973 This is a tread on the cracked stock issue. I think both of mine are beech 1943 & 1947. Personally matched bolt and reciever and overall condition would be my only prefrence. I have not seen many in person but among the ones I have inspected I have never seen a mismatch or a beater. I think Samco and SOG still have the k31 listed and Colorado Gun Sales often has some as well.
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Walnut stocks are all pre-war or early WWII and are usually desired more by collectors. They also tend to not be as beat up. That's why the premium.