You’re correct in that the OP has a different, seemingly non-CK top nut which is incompatible with the lower bearing cover that says ‘GripNut’ on it, and the silver collar is visible.
As mentioned, the original CK GripNut-specific top nut is required to make this headset work.
Doesn't the Gripnut™ top nut have a threaded bit to mate with the top race and clamp the collet to the steerer?
Can't see that in OP's image (though can see what looks like the collet ...).