Rear reflectors really should be red. Back in the old days when everyone sprayed there rear lights with tint spray, they were supplied with additional red reflectors to ensure that they stayed sort of legal.
There were a few people on here that tinted their reflectors on their Mk6's when they fitted .:R lights. Whilst it looks much better and nobody with any authority would every bother about them, IF the car was hit from behind when parked on the road at night, it might give a bit of wriggle out room for the insurance company.