Rolex crown/tube compatibility perplexion…

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Amongst other sizes, Rolex makes crowns in both 5.3mm and 6.0mm diameters. Years ago, they each had dedicated tubes that went with each crown.

I was told years ago, that in an effort to standardize things, the 6mm crowns were re-made to fit the 5.3mm tube size. Now, a parts expert says that it’s not accurate.

Does anyone know the true story here? Thanks.