The ConnectCore 6UL is a system-on-module based on the NXP i.MX6UL processor. The ConnectCore 6UL SBC Pro is a reference design to help you evaluate the ConnectCore 6UL.
The ConnectCore 6UL SBC Express is a reference design for using the castellated pads of the SOM, while the ConnectCore 6UL SBC Pro is the reference design for using the LGA pads and full capabilities of the SOM.
For more information about the processor, see the product page for the i.MX6UL processor.