It is similar if you can get it to run on x86, but NextStep/OpenStep on Intel was notoriously picky about hardware, supporting only a tiny number of video and networking cards. Even virtualization doesn't work that well -- I tried VirtualBox for OpenStep X86 a few years ago and never got the networking to work, and was stuck with subpar VESA graphics.
How does the experience of running NeXTStep or OpenStep in Previous compare to that of running x86 OpenStep or NeXTStep https://www.youtube.com/watch?v=Rz2nPJGx4Qg on x86 hardware, on an old x86 box as in https://www.youtube.com/watch?v=Rz2nPJGx4Qg or on a modern x86 system?