Well, yes, in a way. One of the stubs is longer but the length difference is inside the pumpkin. Because of that, if you're taking an actual sport differential (the inside unit.. not the pumpkin) and installing it into a base pumpkin with base axle stubs, you would have to replace one of the base stubs with a sport stub. But the protruding lengths of both stubs is the same outside of the pumpkin (for installation purposes). A sport pumpkin will bolt directly into a non-sport car and vise-versa. =)
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