For curiosity, what does OS4 offer you over and above MorphOS, anyways?
Perhaps “AmigaOS 4.0” compatibility as oppose to AmigaOS 3.x…
Using a past example ;
Path A: Windows 3.11 -> Windows 9x/Windows NT 4 -> Windows NT 5.x (2K/XP/2K3). Carries the "MS Windows" brand name.
Path B: Windows 3.11-> OS/2 Warp 4.x.
In terms of features and services of 32bit era X86 OS, both OS/2 Warp and Windows NT4.0 offer similar services and features. Both has Win16 compatibility**. The issue is related to what level of “pedigree” does the successor has to the past.
Brand names usually promotes a product to be “inelastic” (referring to demand curve) in a particlar market place.
**With third party add-on OS/2 Warp can also obtain Win32 compatibility.