These Pix32 V6 baseboards can be used with Pix32 V5,V6, and any flight controller that follow the Pix32 V6 Autopilot Bus Standard.
Pix32 V6 Standard Baseboard Ports Pinout can be found here

Pix32 V6 Mini Baseboard Ports Pinout can be found here

Holybro Pix32 V6 Baseboards – Standard / Mini Baseboard Compatible with Pix32 V5,V6