Yes only difference is the input gear so the proportions stay the same. 21 is best with a small high winding motor with a lotta cam so stays near the torque peak and a short axle. Best for speed shifts. 20 is better for a larger slower winding engine with a long axle.
I have a -20 with a warmed over 400 and 3.55 4 pinion. I works for me.
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