BostonJeremy77 wrote on May 20^th, 2021 at 5:46pm:

What difference does it make? None of performance differences between engines are going to be apparent because it's a 747 in everything but visual appearance. I mean, why even bother with anything else if it's not gonna fly like anything other than a 747 with mismatched performance and "outer shell"?

Because I and many others want accurate engine variants. American, Singapore, PreMerge United, ANA, Air New Zealand don't use GE90-90Bs. Wait a few years for another dev then.