panels should all fit. Holes for the badges are different, and I think VSes got an air deflector under the front bumper but that mounts up to the bottom of the radiator support and you wont miss it anyway.
As above, completely interchangable. If the bonnet is genuine holden, the badge holes will be different which just means you'll have a vs lion badge rather than vr
Also washer jets are different. The VR has smaller ones with a smaller hole and the VS has larger ones with larger hole in the bonnet. The vs one will connect the VR hose though so all plug and play. Also other items as mentioned above.