Depends. Version between numbers are not so agressive (1.0 for 1.1 or 1.0 for 1.5), but will be a decent jump between 4.0 for 5.0, so we can get boost or not because PS4 and Xbox One don't have a good reputation of running Unreal Engine games.
And we can't assume Days Gone 2 will use Unreal Engine. If Sony saw potential for Bend Studius, they can give them resources for the company create his own build-in engine just like every first Sony party. Not saying I don't like Days Gone 2 using Unreal Engine 5, but the first Days Gone runs really mix bag on both base PS4 and PRO. I really wish Bend Studius give birth to a hole entire new engine, I mean, look at God of War and Horizon Zero Dawn... they're unlike any game because their engine are uniques.