i9 compatibility

Guy, I'm confused by CPU / motherboard compatibility charts. I've been offered an i9-9900K 1151 someone bought that is incompatible with the motherboard he has, but can't work out whether the motherboard I have can accept it. It is the Gigabyte Z370P D3-CF, and on the Gigabyte site it says "F14"

What does the F14 mean?

Cheers

Les
 
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