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Looking at the rudder servos they are not the same should they not be .
Your powers of observation serve you well. They are actually the same servo, the only difference between the HSB-9360, 70, and 80 is 2 gears inside of them that change the speed of the output shaft. Since we are out of stock on 9380's, I just got a 9370 and changed the 2 gears inside of it to make it a 9380.