@vox
Other than if you use it in your emulated OS3 environment under UAE, it won't make a difference. MOS and OS4 both have newer versions of Exec written for PPC, and depend on a lot of things that are very different from OS3. Even if you could use the OS3 version, it would require emulation, and would end up slower than the native one.
It might make a difference in UAE like I said, but with buckets of CPU power available for a modern PC WinUAE setup, it's probably not that noticeable... Correct me if I'm wrong, but I see this as an improvement for a "real" 68k Amiga only...