I don't have any KMC chains but I just miked a couple of cut-offs from two Shimano and two Wippermann 10-speed chains and got the following measurements across the pin holes of the inner plates:
Shimano: 0,148"- 0.149"
Wippermann: 0.149" - 0.151"
So if your FSA chain is in this range, the KMC/Shimano link will work.