On my shelf (ie not on close inspection), i really can't see much difference between the white cars.
I was a bit pissed off today as mine had a green tampo smudge near one back wheel... but a cotton wool bud and some eucalyptus oil cleaned it up nicely!
I probably wouldn't have been able to do that if he'd have been painted!
He does have a tricky tampo print - the striped design and high contrast makes errors so obvious - but thankfully they've done a pretty good job with it overall.