Aye that's pretty much what I am saying. While no custom-built PC is identical, all PCs just fall under the "PC" category and will play pretty much any PC game assuming the minimum requirements are met.PC has always been the same platform though, their is no "PC 360" or "PC 2" it's the same and has been for years and years.
The hardware changes, but Windows remains pretty much the same, as does Directx.