I just had my County Grille surround painted from a dk Green metallic 2002 defender colour to my Ivory white 1985 110 colour, the same as yours. They got it exact

All I did was take a sample panel in so they could colour match, I used the toolbox lid in the back of the wagon (Unfaded) and they just daubed it underneath with trial colours till they got it perfect.

Any competent panel and paint shop can do this.

I have since had them do 3 other paint matching tasks, similar results

JC