kawasaki sx cylinder identification ??

im a noob, and trying to get some info on kawasaki cylinders, i am referring to my ski 94 sx, i have three cylinders that i bought and they all are different in some ways, one has letter (c) stamped on the flat spots one has (b) and one is milled clean, can anyone help with cylinder identification, i dont know if it was from 94 or earlier, a stand up sit down, or anything, any info i will consider helpful thanks guys.:bad3:
 
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