it's not a ridiculous questionat least when I first pondered it. I wondered why I had not considered that previously tbh.
Butif considering it I think the rear being half the size would cause less than endearing control up front and that is IF
( & I admit it is close to the same shape..) the rear bar could even be fit appropriately up front.
I think there are subtle yet significant bends differences in the front to allow proper clearance and travel and same for the rear although it is missing at least one if not two bends that I can detect .
The only real way to determine would be to take the hour or two it'd take to swap around the two bars & bushings and hook it up to see. Couldn't hurt anything by guinea-pigging your Jeep!
but I am gonna guess it won't be a viable connection.
front JK swaybar
<nonRubicon to show shape outline>
rear JK swaybar <shape outline>
see the differences? I am just too lazy to go out and check but I have seen them enough to have a gut instinct that they aint the same in more ways than girth. if they were interchangeableI think Currie ,ORO TF could sell a single swaybar kit that the only difference was the torsional tolerance of the twist bar instead of arms and mounts for front/rear....