I did not see those stampings on my original calipers but OP, did you check the casting numbers to see if they are Corvette or JL8 castings? Also, did you look for a date stamping on them, I remember seeing a date (the month at least) stamped in mine. I could see where a shop would interchange them back in the day.
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69 Z28 JL8, #'s match - being restored
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