Just get the Passat B6 ones as they'll be cheaper. Get the Passat alloy knuckles as well. Slightly different tie rod angle so the steering response sharpens up a bit too, not to mention an unsprung weight reduction.
I ended up buying the wishbones and s3 bushes/consoles in that ebay advert I linked to before you replied, the bushes are in perfect condition still despite being used. I've also bought new bolts, but have not gotten around to trying to fit yet. I appreciate your feedback above - So the part number for those wishbones is 3C0407153B - which from my searches are from the Passat, unless somebody can beg to differ? I won't be upgrading from the GTI knuckles at this time, the aim was to sharpen up the steering and lose some unsprung weight, which alloy wishbones at half the weight of my current ones and S3 solid bushes should do. Also benefit from keeping everything OEM and rubber, rather than going down the route of an aftermarket Anti-lift kit and polybushes. I might buy some new ball joints because I'll be unbolting them anyway, although mine are currently fine.
My only remaining question is whether the consoles and S3 bushes that came with the wishbones will be a straight fit. My other searches say yes, but conflicting information in this thread says no?!