The Differences. Although the Raspberry Pi Compute Module 4 has the same computing power as the Raspberry Pi 4,one can think of the Raspberry Pi Compute Module as a stripped-down version of the Raspberry Pi 4 with no ports. So, a carrier board is necessary to use the Compute Module The Compute Module 4 IO Board is a companion board for Raspberry Pi Compute Module 4 (supplied separately). It is designed for use both as a development system for Compute Module 4 and as an embedded board integrated into end products

Features:

1. Micro SD card slot
2. CSI interface
3. USB2.0 interface
4. Easy to use
5. Color: green
6. Raspberry Pi Compute Module 4
7. 40PIN GPIO interface
8. PWR indicator
9. ACT indicator
10. AMS1117-3.3
11. BOOT switch

Package Includes:

1 x Waveshare Nano Base Board (B) for Raspberry Pi Compute Module 4, Same Size as the CM4