Translate an NCS colour to RAL quickly and easily by measuring the NCS colour sample using the RAL Color Reader. This will measure any sample target and give the closest RAL number.
An alternative method is a visual check of the NCS colours in the NCS Index against one of the RAL books. The RAL Design system is likely to have the closest match as both systems colours are based similar principles.
It is unlikely a match would be found in the RAL Classic range which only has 216 options. Classic colours are more vibrant than Design colours.
Or you can Order a Colour conversion from NCS Colour in Sweden (they will check visually) https://ncscolour.com/product/colour-translation-notation-to-notation/.