Does anyone know if the brake booster and master cylinder for the VE HSV cars is different to the VY and VZ cars? Also if the HSV versions are different to the regular VE?

I was told that if you're looking at replacing these parts on the earlier cars, the VE setup is a good upgrade, in particular the HSV parts made for the big brake kits but I would have thought that the newer stuff wouldn't fit the older cars like the VY?

If this is a suitable upgrade is it best to source the parts direct from Holden or is it safe to buy them off eBay etc?