Type C header for Gen 1 or Type C header for Gen 2?
The case has a Gen 2 Type C port, which should work with the motherboard's Gen 1 Type C header.
This approach likely won't succeed with Gen 2, while Gen 1 tends to perform better.
USB C typically uses Gen 2, while the blue version corresponds to Gen 1.
It functions efficiently at 5 Gbps connections.
Very confident.
As long as the two ports connect properly, you can be completely confident.