yes and no, its the same physical shape but the gear ratios are different. also the mk2 gti box has 100mm driveshaft flanges, mk1 has 90mm. you can swap flanges or fit 100mm shafts off a later cab or rocco.
ETKA also recons MK2 100mm driveshafts are the same as MK1 100mm driveshafts, but I've never tried this myself to confirm either way.