There is no separate Redmi K30S Ultra / Mi 10T / Mi 10T Pro flashing guide as a supplement to Using MiFlash tool to flashing Xiaomi devices.
iv****04 left a message pointing out that the cameras of Xiaomi 10T Pro and Redmi K30S Ultra are from different manufacturers, so when Xiaomi 10T Pro is flashed with the China ROM, the camera will not open. This information may be helpful to you. Thanks to iv***04.
Here are the specs data from Xiaomi official and wikipedia:
Rear primary camera:
Xiaomi 10T, Redmi K30S Ultra.
Sony imx682 1/1.7-inch 0.8μ (4-in-1 1.6μ) 64MP f/1.89
Xiaomi 10T Pro.
Samsung S5KHMX 1/1.33-inch 0.8μ (quadruple 1.6μ) 108MP f/1.69 (OIS support)