Well, they designed their airframe to handle the larger engines properly, rather than patching it with software. So I'm going to wager that the answer is "a lot less".
Boeing shot themselves in the foot after the awful outsourced supply chain [0] and battery problems on the 787 which meant that they had less financial resources available to go clean sheet and instead they adapted an old design.
[0] https://www.consultancy.uk/news/297/outsourcing-main-cause-f...