The references paint chip chart can be a starting point, BUT paint pigments have taken a HUGE amount of change in the past 50+ years. Old pigments were replaced by new and newer pigments, with no clear cross-ref between the prior and current ones.
Perhaps there is a European equivalent to www.TCPlobal.com ? Realizing you are not in the USA. Might network with some of the www.BBTR.de (might need to manually iinput that address) operatives or other Mopar groups on your side of things for options?