I'm kinda with keoke on this one, as not only do the batches of paint change from batch to batch, (even one drop of tint either way will make a change) one has to consider the composition of the base white has changed over the decades, as well as the tint formula, and the color your trying to match has faded/changed due to chemical breakdown/and or other causes, and even the color pictures from yesteryear will have changed, think you old color family snaps!
One may have to adapt to reality instead of chasing a dream