Your choices of forks and headsets is determined by the head tube diameter. There are adaptors which make it possible to use a fork made for a smaller headset with a frame made for larger, but the reverse isn't possible for the same reason that you can't put 10#s of potatoes in a bag made for 5.
Since the fork is tapered, you're limiting factor will be the diameter at the crown, because you can adapt the narrower upper bearing to the frame if necessary.
So, read the headset specs for the fork and frame, see if it's possible, and look for any adaptors you might need.
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