Well mine certainly isn't grey, it's positively green
I have seen the colour you refer to and yes it has definitely got a greeen shade to it but paint manufacturers seem to have their own grouping system. It may be something to do with their electronic colour detection software. If you go to the site I listed and enter Renault for a make and then grey as a colour it will bring up about 40 colours - some even called beige - crazy I know
That site doesn't give you any swatches though, the link I used does, but still none that match mine.
Using real swatches can be difficult at the best of times depending on the light - time of day etc., and need to be laid down on the surface of the car in question and even then it can be hit and miss at times - ask any car painter or body repair shop. I can't see swatches judged on a computer screen being anywhere near what you expect in the real world. It may be worth sourcing a local paint supplier who has a good range of swatches and a computerised mixing scheme. You also have to remember many paint schemes have variants of the same colour code