My Touch up paint pens arrived today from SMC and confirmed what I already suspected. Its Nissan paint.
I have a K23 Argentum Silver Duster. K23 is the same code used by Nissan but I wasn't sure so got the ones being sold by SMC.
I suspect that all the colours in the current Dacia range are Nissan colours and armed with this info you should find it easier to get after market touch up pains from places like Halfords etc.....
These were the one that I got.
Hope this helps