The international version will be slightly different, it will be using the same hardware but box packing and OS will be different.
The ZUK Z1 (International version) will runs Cyanogen OS 12.1 out of the box based on Android 5.1.1.
ZUK Z1 sports a 5.5 inch FHD screen and houses the Snapdragon 801 quad core processor. It is loaded with 3GB RAM and 64GB storage. Also included is a 13MP SONY IMX214 camera on the rear and an 8MP camera on the front.
Key features are 4G, 3G/2G, Bluetooth, GPS, USB Type-C port, fingerprint scanner and Wi-Fi. This handset gets power from a 4100 mAh battery.