The mark on a Raspberry Pi CM4 or carrier board is a UL flammability rating , not a part of its electronic schematic. It indicates that the PCB material will self-extinguish within 10 seconds of being exposed to a flame and will not produce flaming drips.
To find the correct schematic, you must first understand what the labels on your board mean: cm4 94v0 schematics
: Verify that I2C lines have proper pull-ups, though the CM4 includes some internally for specific banks. 2. Safety and PCB Quality (94V-0) The mark on a Raspberry Pi CM4 or