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Even same brand tyres won't necessarily be the same size
Very true I already experienced this with Conti mtb tyres and Schwalbe road tyres. Also Conti gp4000 was wider than the newer gp5000 (in the same sizes).
Best thing to do if you want to be sure is trying to find someone with exactly the tyres you're after and ask and also ask their rim width -
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Great job