Ok, maybe the hood is Sandalwood Metallic. I know in 04 they changed but there’s one for the 99-03 that’s slightly darker than the Pewter, maybe Sandalwood?
I don’t recall Sandalwood. The only others I recall in GMT800 are gold metallic, storm grey metallic, ultra silver metallic, grey stone metallic, and stealth grey. The lighting must have been way different between the OP’s two pics. The original pic with all the contrast the hood appears to be off of a 99-03 vehicle with 382e Pewter metallic. The OP’s vehicle appears to be 926L silver birch. Of course from pics online it’s impossible to know the hoods match especially if it has ever been reshot. I think there were like 7 variations to 382e pewter metallic over the GM family from the 90s into 2000s.