There were two types of motors, the difference was that the 23 turn had no advance timing, the 27 turn has the timing advanced to get the extra speed out of it as well as different wire thickness. I believe all modern Sport Tuned motors are 27 turn.
I also don't believe Tamiya deliberately made two different types of motor for different markets, more likely Tamiya changed motor suppliers and to match the performance of the old motor the new supplier had an off the shelf 23 turn motor. Tamiya printed up the can and sent this batch to Europe, and someone took the time to unwind one of these.
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