Very interesting – that iPhone sold in mainland China is dual physical SIM, and iPhone sold in the US is dual e-sim.
Not compatible at all.
In the US, iPhone 13 is the last model that has a physical tray, so that you can have a US +1 number (e-sim) and a Chinese +86 number (physical only) in the same device.
E-sim is not technically impossible in China. It’s just not available for smartphones. China Unicom does offer e-sim on some iPad models.