Whatever the real streaght is of different tires , fact is that the tire-makers grooped them in a system.
If you have a sertain sise and speed of tire and pressure for wich the maximum load is calculated. all tires of different brands have the same maximum load.
Little difference between American TRA and European ETRTO system but thats only because difference in AT-pressure used to calculate the maximum load, and the rounding that is done to the first lower Loadindex.
So there can be for instance different constructed 235/75/16 LT D-load tires of TRA system with same maximum load given though to laws of nature the one can bare more load at the same pressure without damaging at a sertain speed then the other.
But this is nothing we can use if we want to determine the advice pressure, we have to go from the information given.
So if , to get ontopic, the Michelin has only yust the maximum load to laws of nature, as given on sidewall it sooner damages when for instance little overloading or lower pressure by misreading of pressure-scale, then an American tire wich ofcource can stand a higher load then given on sidewall:h at the same speedcode.
And again , for this topic this damage done can still be not related to the right pressure for the load to laws of nature, or can be a combination, so a pressure/loadcombination that is yust slightly over the edge and in combination with hitting something that particular damage exists.