AZLOGGER
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I had this very same question about a month ago and posted on a very reputable forum with the same question. At the time I port mapped a 372xp cylinder and a 372K cylinder.
I attached the port mapping numbers for others to view. The numbers are slightly different and some calculation difference is partially from measurement discrepancies. The paper I was using had a slight bow in the top possibly giving measurement a few thousandths short or long.
The end result is: The cylinders are the same!
First of all let me correct you on this one there is no 372K in the Husqvarna lineup just (371K & 375K).
So what is the price difference between the two?
Same price, the old part# will supercede to this part#503 93 93-72, OEM price is $248.85.