Apple Watch Nike* vs. Apple Watch Series 4
What's the difference between Apple Watch Nike+ vs. Apple Watch Series 4?
Are all of the Apple Watch Series 4 faces available on Apple Watch Nike+?
Apple Watch Nike+ is a special version of the Apple Watch that receives special branding and app handling. The Nike+ has all of the native Watch faces, and some special Nike+ ones. Also see this from the Apple Watch User Guide, Faces and features - Apple Support