After having parked next to and/or near many Gunmetal (WV2) 350Z's, this isn't the safest assumption
Just because the donor car is a WV2, doesn't necessarily mean it'll be the same shade of WV2 as yours. Gotta love Nissan paint.
Haha yeah I know this all too well after having a bumper done. Ive quoted the A/L shade as that is my exact shade of the grey, I'm hoping going for a grey one will increase my chances of not having to paint it, unlikely but theres always a chance!