It's the same computer. Macs can install windows on them using a method called Boot Camp, where it partitions the hard drive, installs a copy of windows, and has native drivers for it. It's not an emulated mode but rather just a regular windows install. I mean macs use PC hardware now, i7 processors, amd graphics cards, etc.

I was just surprised that after making FFXIV run in the Mac instead of Windows, that performance went UP.
(This is my laptop setup though, I primarily play on my Desktop)