As production moves along (in time), the factory receives new batches of paint. There may be slight variations from batch to batch so even a factory painted hood may not match.
Regarding IND and their matching abilities, my IB Euro bumper painted by IND is a 100% match in my eyes and I am really picky about paint matching. Other colors may be different. I have noticed that their AW painted reflectors are slightly off.
2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R