I hear what you are saying Lang.
It has been put to me many times , I have never found any evidence to support the theory that manufacture paint varied to any extent in colour.
The method of manufacture ,,,specified weights and measures of pigment such as chromate where those pigments were held to very tight constraints , optical measured comparison with a standard plate and so on left little room for differences.
I also strongly disagree with your contention modern paint manufacturers cant get it right. Spectrography is used to detect copyright infringements routinely these days. Makers of everything from T shirts to I phone cases use very specific colors that are not able to be exactly reproduced without knowing the pigment make up...spectrographs ate sensitive enough to pick iup those differences.
It wasn't as hit and miss as you contend in WWII and its not now so far as my research has revealed
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