The gear housings are all the same, its the complete gearbox that has a different part number because the gears inside are different.
Tim
Tim, after reading your response, i rechecked my parts drawings...and you are correct. i missed the fact that they listed the 'housing' separate as the 'gear case'. i presumed the 'gear case' was just that, the case, not the entire box! both models list the same # for the 'housing'....so i do believe that the gear swap is entirely doable...$160 for the gear, $14 for the seal.
thanks for setting me straight.