I have a pair of smooth N-frame stocks dating to 1953 with the same type of stock circles as on your K-frame stocks. It is the only pair I have in my collection like this (of the many). I checked a pair of N-frame target stocks dating to November 1951 (first pair for an N-frame made, and original to the 1950 45 Target revolver the stocks are on) and it has the regular type stock circles.
Probably just another manufacturing variation.
Bill
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