While the full internal schematic of the CM4 module itself is proprietary, Raspberry Pi provides "reduced" schematics and complete designs for the official IO Board to help developers.
This document shows the core pinout and essential power circuitry of the module. Download CM4 Reduced Schematics cm4 94v0 schematics free
When you see "94V-0" printed on a CM4 board, it is not a model number but a . This is a safety certification indicating: While the full internal schematic of the CM4