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If you need two bottles of the same shade, just mix them together. I've been down that road a few times. Same manufacturer same type paint shouldn't be a problem.
I've seen professional house painters do that, keeps the home owner from complaining that two walls are slightly different colors. Of course model builders these days go to great lengths to get slightly different shades on different parts of their models.
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I get your point for sure when dealing with FS,RAL,RLM colors, you want the match for sure, but with the rust, wouldn't different shades be more realistic.
Good point, the paint companies sell different versions of rust for exactly that reason.
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Kinda wondering if there is a counterfeit market.
Or a paint seller could have switched suppliers resulting in slightly different batches of what is supposed to be the same color. In any event, it looks like you have some young rust and middle-aged rust which seems like a good thing to have on hand.