They are different, gti/vr6 has wider tracking and as mentioned different arb mounting points. From VW they are £106+VAT a side. Then you need the balljoint ect. I got balljoint bushes and arms both sides from a place called B and B components in maidstone for £93 after recommendations on here.
Just a heads up aswell, i went to do mine on friday and the front bolt snapped in the subframe and i havnt been able to get it out! Im now looking for a new subframe. If you can, wd40, a blow torch and a impact air gun. Mine was really stuck though!
Hope this helps bud.