Chris, When my car was being restored about 4 years ago the repros were not available yet, I asked on anouther forum what White was correct, I believe that it was Charles that told me that '65 Mustang interior (White) was an accepted choice.
It almost looks like Wimbledon White, but just a tad lighter in hue.
I would say then that the one from today on the right in your picture is more correct.
Others may have other opinions though.
I'd be curious why Drake changed the shade of White they use on these.