These Pixhawk baseboards can be used with Pixhawk 6X, 5X, and any flight controller that follow the Pixhawk Autopilot Bus Standard.
Pixhawk Standard Baseboard v2A & V2B Ports can be found here
Pixhawk Standard Baseboard v1 Ports Pinout can be found here
Pixhawk Mini Baseboard Ports Pinout can be found here