I've heard you can take a chip of paint to some paint specialists and they can work some magic to determine what made it, and create a replicant color. You'd have to call around though.

Otherwise, I thought (could be wrong here) you could buy a light/laser thing that could identify colors. Something like this

https://www.amazon.com/Nix-Mini-Color-Sensor-Instantly/dp/B084Z62KX3?th=1