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But I don't think that's a problem for a lot of people if you're talking about a £200 freehub replacement compared with £30 Ultegra one. But are they compatible?
EDIT
I just found a YouTube clip
https://youtu.be/e6Z5QcngH6A
In the comments someone asks the same question and the mechanic replied saying as long as they are both 11 speed you can use a Ultegra hub - heavier but almost 10 times cheaper!
EDIT 2
SJS Cycles also state it is compatible on their website
https://www.sjscycles.co.uk/hub-spares/shimano-ultegra-wh6800-cassette-freehub-body-y49398060/
The cheaper Shimano freehubs are steel not aluminium, so will be heavier than the titanium freehubs used on Dura Ace models.