There are many paint manufactures out there and each use a different system to identify ther colours. Some are mixed to match specific, usually war time colours, others are well, colours. Kit instructions will inveriably use the kit makers brand of paint. Most modellers will find a brand that suits them, which they get to know pretty well, using other brands for specific colours which are not in the favourite brand.
The Heller 1/12 RE20 Renault kit, sounds like a car? If that is the case It is very unlikely that you will be able to find a match in hobby paints. You my be able to buy a touch up paint or even an aerosol but be very careful that the paint can be used on plastic, you may have to use a "plastic primer" first. Halfords sell plastic primer, grey and white, they may sell the paint you require as well.
The list of paints that you give may contain a good match for the body of the model and you could be very happy with that. Most of those colours are pretty generic, 11-silver, 53-gunmetal, 56-aluminium.
As Nige says bookmark the chart, it'll come in handy
Do let us know how you get on.