In the late 1960's that Tobacco leaf appeared, Land Rovers came only in the six following colours: Bronze green, Light green, Mid gray, Limestone, Marine blue and Sand (Export only). So nothing really close to Tobacco leaf. Even in Range Rovers that came later, as far as i know there was never a hue called "Arizona". There was Sandglow, but this was too yellow to be close to Tobacco leaf.
Edit: I have just found that Arizona tan is a 1980's Land Rover 90-110 colour, so too late to be anyhow related with Tobacco leaf.