I have both Hookbills and Runners, and they are only somewhat similar. The runners are of course much taller, and they move quite differently than the Hookbills, starting from hatch:
The Dutch Hookbill turned out to be a snowy male, the gray runners were three males, two females.
For a comparison, here is a set of Hookbills in the same brooder setup:
As you may have already read, some Hookbills have a more extreme hook than others. I have noticed that some ducklings have pronounced hooked bills right from the start.
I can't say that I have seen any amount of hook in my runners at any age. My runner stock was originally from Holderread and are show stock, so there may be more variation in the non-show runners. I am embarrassed to admit, I don't have good photos of my runners, except when they are enjoying the mud.
BTW, that's a pair of snowy Hookbills in the cage, no doubt wishing they were out there, too!